Operating system concepts final exam jobber

...have a system developed in Scriptcase, which is a framework for code generation and php coding. I have been trying to access Mailgun from my system, using API. This worked for a while, but now I get errors and meet different challenges. I have tried to move to a different webserver , but my skills are limited on this and I need help. Before sending the email, I am trying to convert a html code into a pdf file. This pdf file is ment to be an attachment in the email. After upgrading to php 8.1, this also does not work any more, but result in an error message. Helping me to fix this, is also a part of the project. I need help from someone who can assist me on my computer (using remote desctop), so I can solve the issues and be able to send emails through the Mailg...

Trenger hjelp til å lage et admin/crew system med følgende spesifikasjoner: Prospekt for crew database Formål: Målet med systemet er og få en oversikt over crew og de som jobber der. Systemet skal utformes slik at det er lett og ta kontakt, dele dokumenter og for hvert crew medlem å se sine oppgaver/gjøremål. Utforming: Systemet skal utformes slik at det er enkelt og bruke. Brukere skal kunne enkelt ta kontakt med sin chief eller administrator. Det skal også være mulig for brukere og komme med forslag til utbedringer. Moduler: Administrator Oversikt over regristerte brukere Kunne slette/gi rettigheter Legge til brukere Sende ut dokumenter / Informasjon Slette dokumenter / Informasjon Redigere bruke...

Database Management System Database CONCEPTS

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Hei, ser du er norge og fra Halden, kommer fra Halden jeg også. Jobber for tiden med et lite hobby prosjekt i HTML, PHP å Javascript. jeg er ingne programmerer men prøver å få gjort det meste selv. trenger en jeg kan leie inn for gjøre små ting i koden og bygge opp script jeg ikke klarer selv siden du er norsk så hadde du passet bra, er noe du tar på deg? Det som skal er kodes er php script og javascript. kanskje noen css inne mellom hvis jeg strå fast på noe.

Mengkonversi & mengembangkan system yang sudah ada ke dalam pemrograman WEB dengan ASP.NET

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...application requirements by analyzing user requirements, prototyping system features and functionality. Design and develop user interfaces to internet/intranet applications by setting expectations and features priorities throughout development life cycle; determining design methodologies and tool sets; completing programming using languages and software products; designing and conducting tests. Research, Development, Team Development: Recommend system solutions by comparing advantages and disadvantages of custom development and purchase alternatives. Coordinate requirements, schedules, and activities, contribute to team meetings, and troubleshoot development and production problems across multiple environments and operating platforms. Provide support to colleagu...

I am in need of a professional who can develop a comprehensive Visa Application System to support appointments and applications for different types of visas, mostly for employment purposes. Key Requirements: - The system must be able to process 2-5 different types of visa applications. - It should support multiple European languages. - The system should handle appointment scheduling for Visa Application Centers (VFS). Ideal Skills/Experience: - Proficiency in developing web-based systems, especially appointment and application systems. - Experience in multilingual system development, especially European languages. - Knowledge of the Visa Application process and system requirements is a plus.

...experience in creating APIs for Autodesk Revit in C#. This project involves integrating a queue system into the API that works with all versions of Revit. Key Requirements: - Expertise in C# and Autodesk Revit API: You should have a deep understanding of C# programming language and experience working with the Autodesk Revit software. - Queuing System Development: The main task in this project is to design a queue system that allows users to create, manage tickets and get notifications and alerts. Your task will be to: - Develop an API that works with all versions of Autodesk Revit - Implement functions for creating, modifying and deleting elements in Revit - Design and integrate a user-friendly queue system that allows for ticket creation and management -...

I'm currently in need of a unique and captivating logo for my new TV series called "Seas of Flavor". This show is all about the thrill of adventure, the art of culinary, and the passion of fishing. Key Requirements: - Color Scheme: Stay primarily wit...suitable colors that supplement the blue and tie into the theme of the show. - Design Type: Aim for a combination design that integrates both symbolic and typographic elements. - Mood: The logo should communicate a sense of 'Adventure', the culinary art, and fishing. Qualities I value in the successful designer include creativity, a discerning eye for color, and a knack for capturing intangible concepts in a symbolic format. Prior experience designing logos for TV shows or related industries would be a bo...

...industry reports to understand market trends and forecasts. 2. Financial Model Construction: - Interlinked Three-Statement Model: - Income Statement Projections:Forecast revenue growth based on historical trends and strategic initiatives. Estimate costs such as COGS, operating expenses, and depreciation based on assumptions - Balance Sheet Projections:Project key items like working capital, fixed assets, debt, and equity based on historical ratios and expected changes. - Cash Flow Projections:Derive operating cash flow from projected income statements and balance sheet changes. Estimate capital expenditures and financing activities. - Dynamic Model: - Create a dynamic model in Excel, ensuring that changes in assumptions automatically update all rel...

I'm seeking an Autodesk Inventor expert to utilize the shaft component generator to create a straightforward shaft based on technical drawings. Key Respo...that meets the specified dimensions - Maintain clear communication throughout the project Ideal Skills and Experience: - Proficient in Autodesk Inventor 2022, with a strong understanding of the shaft component generator - Capability to interpret technical drawings accurately - Previous experience in shaft design and power transmission systems is a plus - Strong attention to detail to ensure the final design meets the specified dimensions - Excellent communication skills to provide updates and seek clarification as needed. I am looking to work with a competent freelancer who can deliver a high-quality design within the a...

...shopping visits and audits. This assignment is an audit of an Examination Centre, checking that the security standards are being met. You MUST HAVE fluent English skills, and you must be able to communicate in a professional manner and be smart and well-presented, as you will be representing us during the audit. As an auditor, you will arrive at the test center an hour before the start of the exam, give your ID, show a letter of authorization, which we will provide for you beforehand, and tell them what you are there to do. You will then sit with the TCA or the manager and ask a series of questions, and ask to see various things. The audit itself is very simple and easy, as we give you the form and you only have to ask the TCA/manager all the questions exactly as they are writ...

I'm looking for a skilled video editor to create a YouTube like, subscribe video end screen for my videos so people can subscribe to my channel. The video should be 5 seconds long, realistic in style, and include the following elements...following elements: - Incorporation of a high-resolution logo - Inclusion of a professional photo of myself - Adding a graphic with my website URL Ideal candidates should have: - Proficiency in video editing software - Experience in creating engaging and visually appealing content for social media platforms - Strong attention to detail and ability to follow specific design guidelines The final delivery should be a high-quality, seamless video that I can easily add to the end of my YouTube videos. Please provide samples of your previous wo...

I'm looking for someone to convert my 1-10 page PDF document into a Word file. Here are the project specifics: - **Word File**: The final Word file should maintain the original formatting of the PDF. - **Content**: The PDF is text-only, with no images or graphics that need to be transferred to the Word document. The ideal candidate for this project should have: - Experience in PDF to Word conversions. - Proficiency in preserving original formatting during conversions. - Attention to detail to ensure all text is accurately transferred. Please bid if you're confident in handling this task with precision and meeting the formatting requirements.

I'm in need of an expert software developer to create Trinamic motor control software. The sof...motor control software. The software needs to be compatible with Trinamic motor control boards, specifically the TMCM-1260. The language required is Trinamic motor control command set. Key details include: - Operating System compatibility: Windows, Linux, and MacOS. - Required Programming Language: Trinamic Motor Control Command Set. - Timeline: Expected completion of the project is ASAP. Ideal Candidate: Would have experience and skill in dealing with motor control boards, TMCM-1260 in particular, as well as the Trinamic command set. A comprehensive understanding of multiple operating systems will be beneficial too. Those who can work within a tight timeframe would ...

First Milestone: 750rs for options and 2-3 demo Design Second Milestone:750rs for final design and deliverables with expected modifications

I'm in need of a skilled videographer for a promotional video creation project. I require promotional videos suitable for our own youtube, facebook for our tyre brands. These videos will be used for promotional purposes, showcasing tyre shop interviews and tyre product demonstrations. The final product should be engaging and polished. We have had our tyre shop and tyres ready in Brazil, waiting for the videographer to take the videos. Key Requirements: - Incorporate tyre shop interviews and tyre product demonstrations - High-quality video:4K - Expertise in creating engaging and effective promotional videos - Deliver the video in a format suitable for social media, such as MP4. for youtube, facebook. - Location: appointed tyre shop in Uberlândia, Brazil - Shoot...

I'm in need of an intermediate SAP PS Consultant who can assist in training purposes. My goal is to bring someone on board who can guide my team in understanding and utilizing SAP Project Systems effectively. This will involve explaining complex concepts in a way that is easy for beginners to understand, while still providing the depth of information required for them to become proficient. Ideal candidates should have a solid grasp of SAP PS and a proven ability to teach or train others, while understanding the specific needs of a beginner or intermediate learner. It's crucial that they are able to deliver this guidance efficiently and effectively within a short period of time, as the project is expected to last less than a month. If you're someone with the righ...

I'm in search of a professional in deep learning, preferably a PhD, who can serve as a mentor for various aspects of neural network design, such as: Your task will be: - Preparing very specific ML/NN live lessons for me - Helping me debug my code if I am...better ways of doing things - Helping me to install 3rd party software on Windows - Helping me to run open source projects downloaded from GitHub - We will work mainly in C#, C++ - Python will be optional The ideal candidate should possess: - A PhD in the field of deep learning - Previous experience in designing neural networks - Strong communication skills to effectively explain complex concepts in a clear manner Don't bid if - you have no research experience - you have no journal publication - you are ne...

I'm in need of a video editor who can transform my raw YouTube footage into engaging educational content that resonates with my target...YouTube footage into engaging educational content that resonates with my target audience. Key Responsibilities: - Edit raw footage into engaging educational content - Suggest and incorporate suitable visual aids, animations, and transitions - Ensure the content is both informative and visually appealing Ideal Skills and Experience: - Proficient in video editing software (e.g. Adobe Premiere Pro, Final Cut Pro) - Experience in creating educational content for YouTube is a plus - Strong understanding of video pacing, visual storytelling, and audience engagement - Good eye for design and ability to suggest and implement visual aids for educa...

I'm in need of a reliable and responsible individual who is proficient in academic writing and well-versed in social media topics. Key Requirements: - Proficiency in academic writing, particularly in essay writing - Understanding of social media, for effectively integrating related topics into...responsibility and reliability Besides, I am very picky at the quality and if the works are not good, I would ask for the refund. So for those who are well prepared and confident in this work, pls contact me. The job will mainly involve writing essays on social media related topics. The right candidate will have a good grasp of academic writing techniques and can effectively incorporate social media concepts. The aim is to create content that is engaging, informative, and of high ac...

I'm in search for an experienced Java programmer with a clear understanding of the .mp4 standard to build a code that encapsulates a data stream in a previously recorded video. Specific knowledge of Ffmpeg is needed. The task at hand mainly revolves around end-processing, as the text file needs to be submerged after the final video compression. The text file will be in the .srt format, and no encryption or compression will be required for this item. Ideal candidate should be familiar with handling these types of video data stream manipulations.

...experienced CISSP certified instructor with an advanced level of knowledge. The ideal candidate should be able to deliver these classes in an in-person format. Key Training Areas: - Security and Risk Management - Asset Security - Security Architecture and Engineering I need someone who can provide thorough explanations and practical examples of these topics. Your role will be to break down complex concepts into understandable parts for the students. This means ensuring the content is clear, concise, and engaging. Ideal Skills and Experience: - Advanced CISSP certification - Experience in in-person training - Strong communication and presentation skills - Ability to simplify complex ideas - Understanding of adult learning principles Please only apply if you are an Advanced CI...

Hola, necesito crear una plataforma o pagina de venta ...cliente que hace la consulta, una vez aceptada la venta, se encargará de realizar el pedido a la web de mi proveedor, asignar la dirección de entrega con los datos que facilite el cliente y emitir y enviar la factura correspondiente desde mi programa de gestión, además de enviar un mail confirmando los datos de su compra. también atender consultas y soporte post venta. la idea es que el cliente final pueda disponer de un amplio catálogo de productos ya que todos mis proveedores serán agrupados en la comparación de su solicitud, y disponer del producto solicitado al mejor precio. esa herramienta además tiene que estar preparada para interactuar con aplicaciones exte...

...design should be versatile enough to be used across various platforms, including the app, website, social media, and marketing materials. Deliverables Primary Logo: A high-resolution logo in both color and black-and-white versions. App Icon: A version of the logo optimized for use as an app icon, adhering to standard app icon dimensions and requirements. File Formats: Provide the final logo in various formats (e.g., PNG, JPEG, SVG, EPS) to ensure flexibility in usage. Target Audience The target audience for the fitness app includes fitness enthusiasts, casual exercisers, and anyone looking to improve their health and earn rewards through physical activity. The logo should appeal to a broad demographic, emphasizing the fun and rewarding aspects of using the app. Ti...

I'm in search of a proficient translator who is fluent in French and English to proofread a set of video subtitles. Key Project Requirements: - Proofreading of English to French translations - Experience with proofreading vid...who is fluent in French and English to proofread a set of video subtitles. Key Project Requirements: - Proofreading of English to French translations - Experience with proofreading video subtitles The video length exceeds 15 minutes, so I need you to have a good attention to detail and thorough proofreading skills to ensure the translation is accurate and captures the intended meaning. The final deliverable should be the proofread subtitles in a separate SRT file. Subtitles should be error-free, idiomatic and culturally appropriate for French-sp...

...and minimalist logo for our brand "COSPN". This logo will serve as a representation of the values that we stand for and embody, which include professionalism, modernity and trustworthiness. Key Requirements: • The logo should combine imagery and text. • The color scheme must be Onxy (#353935) or similar & Gold, and no other colors should be used. • The final design should reflect modernity. • The design should be minimalist. • The final deliverable must include the source file with all the fonts and elements used. • Need 3 PNG files, one is full black, one full white, one actual color. Skills and Experience: • Proficient in major design software (Adobe Illustrator, Photoshop or similar). • Portfolio demonstrating ex...

...I'm seeking a skilled freelance graphic designer and web developer to help establish my brand. As a student and entrepreneur, I aim to create impactful designs and a robust online presence that promotes education. - **Graphic Designer Requirements**: - Proven experience in logo design and branding - Portfolio showcasing educational or awareness projects - Ability to translate educational concepts into visual designs that resonate with the target audience - **Web Developer Requirements**: - Experience in creating user-friendly and visually appealing websites - Proficiency in web development languages and CMS (e.g., HTML, CSS, JavaScript, WordPress) - Understanding of best practices for educational content visibility and SEO The project will involve two main tas...

I'm seeking an experienced graphic designer for branding strategy and digital marketing. My ideal freelancer will have: - Proficiency in contemporary design to create a modern and minimalist look. - Strong knowledge of branding and corporate identity development. - Ability to transform abstract concepts into impactful, visually stunning designs. In this assignment, you'll: - Create a professional, modern and minimalist branding strategy. - Align all design elements with the company's vision and objectives. - Develop a consistent and cohesive image across all platforms and materials. - Opportunity for more long term contract Your portfolio showcasing similar past projects will be highly appreciated. Looking forward to your innovative ideas and designs.

As a photographer, I require assistance with retouching and removing specific objects from my photos. The final images should present a clean result, amplified by flawless retouching and thorough object removal. This job involves: - Enhancing the quality of the photographs by applying suitable retouching techniques. - Removing designated objects cleanly from the background of images. The desired outcome after these edits should leave the pictures looking realistic, professional, and visually appealing. Expertise in Adobe Photoshop and a keen eye for detail would be greatly appreciated for this task. Previous experience in photo editing and manipulation is an advantage.

I'm seeking a creative and experienced graphic designer to design a logo for my rock band. The final design should be striking, memorable, and suitable for a rock band. The band's name is Rockafella. We just want the attached style, the logo colours white, black and red pretty much the same as the attached picks with the lighting bolt. will be used web site FB, Insta and t-shirts etc.

...design should be versatile, and adaptable to various sizes and formats (e.g., print, digital) Additional Notes: The name "Collect Me" (إجمعني) was chosen to emphasize the company's innovative service, where bins communicate their fullness and request collection. Feel free to present multiple design concepts for consideration Prioritize originality and avoid clichés in the design Seek inspiration from successful environmental or waste management brands Deliverables: High-resolution files of the final logo design in various formats (e.g., PNG, JPEG, SVG) for both Arabic (إجمعني) and English (Collect Me) versions A style guide outlining the proper usage of the logo and its color variations We look forward to your creative interpretations of our brand v...

I'm looking for a freelancer to help me create an educational PowerPoint presentation. The main task is to extract key points, concepts and ideas from a provided books, and translate them into a detailed, chapter-by-chapter analysis. Key deliverables: - A comprehensive analysis of each chapter - Ensuring content is engaging, informative and educational - Creating a structured, well-organized PowerPoint presentation The ideal candidate for this job should have: - Strong understanding of educational materials and concepts - Proven experience in creating detailed, educational PowerPoint presentations - Ability to work with content from books and distill key information - Strong design skills, with an emphasis on professional and formal design - Good communication skills ...

I'm in need of a structural engineer and designer who is well-versed in tensile design, particularly for a medium-scale project involving commercial canopies. The main goal of this project is to conduct a thorough structural analysis to ensure the safety, stability, and durability of the final design. Key Requirements: - Expertise in tensile design: The ideal candidate should have a solid background and extensive experience in both designing and conducting structural analysis for tensile structures. - Familiarity with both fabric and steel cables: The chosen materials for this project are fabric and steel cables. Therefore, prior experience working with these materials in tensile structures is highly preferred. - Medium-scale project experience: Since this is a medium-scale pr...

I'm looking for a highly skilled professional to develop a mobile application for managing a small inventory of less than 100 products. Key functions: - Inventory tracking: The application needs to monitor and update inventory levels dynamically as sales and restocks occur. - Comprehensive reporting: I require detailed inventory level reports to ensure steady product availability. Ideal Skills and Experience: - Proficiency in mobile app development: You should have a robust portfolio of mobile applications, particularly those with inventory management features. - Understanding of inventory systems: Experience with inventory control mechanisms and generating inventory level reports is critical for this project.

I have a to-do list currently in a word document that I'd like to have recreated in Google Sheets. This newly created spreadsheet should have an additional summary page. Key Requirements: - I require the spreadsheet to have automatic calculations. For example, I'd like the sheet to automatically sum up the tasks, highlight overdue tasks and...sheet should be user-friendly and easy to navigate, with clear headings and sections that I can easily edit and add to. Ideal Skills: - Proficiency in Google Sheets and advanced knowledge of its functionalities. - Experience in creating automated spreadsheets with features like automatic calculations, data sorting/filtering, and conditional formatting. - Strong attention to detail to ensure the final spreadsheet is both accurate and...

I'm looking for an experienced content writer to create informative blog posts specifically on technology topics. Key Responsibilities: - Crafting engaging and informative blog posts on a variety of technology-related subjects. - Ensuring content is written in an accessible and easy-to-understand manner, catering ...writing, particularly in the technology niche. - Ability to write in an informative and engaging style, tailored to a general audience. - Strong research skills to delve into various tech topics and distill complex information into digestible content. - Familiarity with SEO best practices and content optimization is a plus. If you're a tech-savvy content writer who excels at simplifying complex concepts and making them accessible to a broader audience, I'...

I'm seeking an experienced cameraman to support a documentary project for online media. - Event Type: Documentary/Interview/Broll Your primary task would be capturing the essence of these important topics through high-quality video. I'm looking for a professional who can bring creativity and passion to this project. Key requirements: - Proficiency in operating professional cameras and related equipment - Prior experience working on documentary projects, especially related to social issues - Proven ability to capture compelling, high-quality footage While I don't require editing services as part of this project, your understanding of how footage will be used in post-production would be an advantage. If you have the right skills for this opportunity, please share ...

We need to development a Pament Management System for parking car's based on Django as backend and React on the frontend

see links on attachments to match style and font. Must use attachments. please read criteria -for using a clear letter type word graphics. Use arial, calibri or similar font, in upper and lower case. this is to promote a conference - a speaker series Do...subject of lifestyle and culture. This project should mainly feature eye-catching visuals or graphics to draw readers in. - Design Style: Vibrant and bold to reflect an exciting lifestyle and culture theme. - Key Elements: Concentrate on creating captivating visuals or graphics that bring the cover alive. Ideal skills include prior experience in creating magazine covers, ability to portray complex concepts through minimal design elements and experience in graphic design. A portfolio showcasing similar works will be highly ap...

I'm seeking a dedicated field representative to interact directly with General Practitioners within our local area. You must have prior experience directly visiting GP's or Specialist and their Practice staff. Flexible Part time Independent Contractor Position Key Responsibilities: - Your primary role will be traveling to and cal...market position and understand client needs. - Lastly, part of your role will involve troubleshooting any issues that doctors might face with our services or products. The ideal candidate for this position should possess great interpersonal skills, a background in sales or marketing, and have experience dealing with healthcare professionals. A problem-solver with an analytical mind who's used to operating at the local level would be t...

Must use attachments. I need a bold and vibrant magazine cover design that reflects the core subject of lifestyle and culture. This project should mainly feature eye-catching visuals or graphics to draw readers in. - Design Style: Vibrant and bold to reflec...subject of lifestyle and culture. This project should mainly feature eye-catching visuals or graphics to draw readers in. - Design Style: Vibrant and bold to reflect an exciting lifestyle and culture theme. - Key Elements: Concentrate on creating captivating visuals or graphics that bring the cover alive. Ideal skills include prior experience in creating magazine covers, ability to portray complex concepts through minimal design elements and experience in graphic design. A portfolio showcasing similar works will be highly ap...

I'm in need of a proficient developer to create an eCommerce website for my Will Writing service. As I have a specific design concept in mind, you would have to bring this idea to life. The website should be integrated w...in need of a proficient developer to create an eCommerce website for my Will Writing service. As I have a specific design concept in mind, you would have to bring this idea to life. The website should be integrated with PayPal for secure transactions. Key requirements are: - Proven experience in eCommerce website creation - Proficient with PayPal integration - Excellent in translating design concepts to live websites Understanding of the Will Writing business is a plus but not essential. Let's create a user-friendly platform scrutinizing each detail o...

For this task, I need a freelancer with exceptional attention to detail to type up a very clearly handwritten document into a PDF. The ideal candidate will have: - Excellent typing skills - Proven track record for data entry tasks - Experience with transcription services - Proficiency in using PDF softwar...task, I need a freelancer with exceptional attention to detail to type up a very clearly handwritten document into a PDF. The ideal candidate will have: - Excellent typing skills - Proven track record for data entry tasks - Experience with transcription services - Proficiency in using PDF software like Adobe Acrobat Your job will be to ensure the transcription is accurate and error-free. The final output must be a PDF document that exactly replicates the original handwritte...

Your tasks will include: - Conducting research to ensure accuracy and up-to-date information - Breaking down complex medical concepts into understandable language for novice medical students - Ensuring the content is engaging and holds the attention of the target audience Ideal candidates should have: - Previous experience in medical writing, especially creating educational materials - A good understanding of medical terminology and the ability to simplify complex information - The capability to conduct research and accurately cite sources - Excellent writing skills with a focus on clarity and engaging storytelling. Please include samples of your previous medical writing work when applying.

I'm on the hunt for a talented voice-over artist with a youthful (teenager to twenties) voice. This is for a commercial advertisement for radio. The overall tone I'm aiming for i...professional. Key Requirements: - Voice: I'm looking for a young female voice, ideally in the teenager to twenties age range, to resonate with the target audience. - Experience: Experience in commercial voice-overs is a significant plus. - Style: The ideal candidate should be able to deliver a smooth and professional tone, making the advertisement engaging and captivating. - Audio Quality: The final audio should be of high quality, clear and free from background noise. If you have the talent and tools to bring this vision to life, I'd love to hear from you. Please share your portfoli...

...clean, minimalist illustrations. - Design flexibility to tie in the different themes for each journal. - Capacity to use specific elements that align with the journal's theme, such as yoga poses, nature elements, wellness symbols, etc., and tell a story through design. Ideal Skills and Experience: - Previous experience with minimalistic design and illustration. - An understanding of wellness concepts, in particular holistic wellness, yoga and mindfulness. - Proven ability to integrate diverse themes into visually cohesive designs. - Attention to detail and an aptitude for conveying complex ideas through illustrations. Please include examples of previous design work, especially any that fall within the parameters of this project. Looking forward to working with an arti...

...would need to be capable of these tasks. Experience in scriptwriting and/or storyboarding for science-related content would be a bonus. - The animation style should possess a moderate level of detail. It shouldn't be overly simplistic, but doesn't need to be highly intricate either. The goal is to communicate the astrophysics concepts clearly and engagingly. Ensure accuracy and clarity in your explanations. Use appropriate visuals, animations, and narration to make the concepts understandable. The video should be engaging and informative, targeting an audience with little to no prior knowledge of the subject matter. Pay attention to transitions between topics to ensure a smooth flow of information. Topics - Big-Bang theory Hubble’s Law and Doppler effect ...