CS50x 2026 - Lecture 0 - Scratch

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*** This is CS50, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming. *** TABLE OF CONTENTS 00:00:00 - Introduction 00:02:03 - This is CS50 00:02:24 - Artificial Intelligence 00:14:12 - Computer Science 00:15:36 - Unary 00:16:06 - Binary 00:29:46 - ASCII 00:40:52 - Unicode 00:44:57 - Color 00:50:17 - Representation 00:55:23 - Algorithms 01:04:45 - Pseudocode 01:14:09 - Scratch 01:18:15 - Hello, World 01:21:21 - Hello, You 01:30:20 - Meow 01:33:51 - Abstractions 01:37:55 - Conditionals 01:40:05 - Oscartime 01:51:59 - Ivy’s Hardest Game *** HOW TO SUBSCRIBE HOW TO TAKE CS50 edX: Harvard Extension School: Harvard Summer School: OpenCourseWare: HOW TO JOIN CS50 COMMUNITIES Bluesky: Discord: Ed: Facebook Group: Faceboook Page: GitHub: Gitter: Instagram: LinkedIn Group: LinkedIn Page: Medium: Quora: Reddit: Slack: Snapchat: SoundCloud: Stack Exchange: Telegram: Threads: TikTok: Twitter: Twitter Community: YouTube: HOW TO FOLLOW DAVID J. MALAN Facebook: GitHub: Instagram: LinkedIn: Quora: Threads: TikTok: Twitter: *** CS50 SHOP *** LICENSE CC BY-NC-SA 4.0 Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License David J. Malan [email protected]