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CS50

@cs50.harvard.edu
3.2K followers 1 following 125 posts

From the team that brought you CS50 at Harvard, Yale, and Oxford, this is the Fifty Foundation, led by @davidjmalan.bsky.social et al. Theatrical courses in computer science and math. For free, for all. 🎭

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CS50 @cs50.harvard.edu · 24/09/2026
Professor @davidjmalan.bsky.social goes on ABC’s Radio National Breakfast to talk about the nature of social media algorithms and what their regulation could look like. www.abc.net.au/listen/progr...
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CS50 @cs50.harvard.edu · 18/08/2026
Olá, mundo! Estamos empolgados em lançar o CS50x, dublado em português. Aprenda os fundamentos da ciência da computação, desde a programação em diferentes linguagens até a compreensão da inteligência artificial, e muito mais. cs50.ly/pt, made possible with lingopal.ai.
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CS50 @cs50.harvard.edu · 13/08/2026
¡Hola, mundo! Estamos lanzando CS50x doblado al español. Las 12 clases, con temas que van desde Scratch hasta Estructuras de Datos, ya están disponibles totalmente dobladas al español. ¡Feliz aprendizaje! cs50.ly/es, made possible with lingopal.ai.
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CS50 @cs50.harvard.edu · 21/07/2026
Join us for one of two Zoom-based training sessions on Classroom 50 on Fri, July 24, 1-2 pm EDT. Access the session through Zoom: zoom.us/meeting/regi....
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CS50 @cs50.harvard.edu · 10/07/2026
Join us today for the final Chapter 7 of Introduction to Artificial Intelligence with Brian Yu. Learn how AI can even move cars! youtube.com/live/HWgtlQ9...
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CS50 @cs50.harvard.edu · 09/07/2026
Join us today for Chapter 6 of Introduction to Artificial Intelligence with Brian Yu. Learn how AI can generate text, images, video, and more. www.youtube.com/live/H4JgA0y...
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CS50 @cs50.harvard.edu · 08/07/2026
Join us today for Chapters 4 and 5 of Introduction to Artificial Intelligence with Brian Yu. Learn how AI can sense objects and communicate with us humans. youtube.com/live/ttolMw1... | youtube.com/live/G_ZBZ8e...
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CS50 @cs50.harvard.edu · 07/07/2026
Join us today for Chapters 2 and 3 of Introduction to Artificial Intelligence with Brian Yu. Learn how AI can make predictions and analyze data for you. youtube.com/live/gikcyLZ... | youtube.com/live/CVPosMW...
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CS50 @cs50.harvard.edu · 06/07/2026
Join us today for Chapter 1 of a free, live, online series introducing the fundamentals of artificial intelligence (AI). This series is designed for anyone interested in better understanding how AI works and the ideas that make it possible. youtube.com/live/3q4KDSm...
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CS50 @cs50.harvard.edu · 03/06/2026
Have you started CS50 2D yet? 🎮 This newest course by CS50 is a great place to go after finishing CS50x. Learn the fundamentals of creating 2D games. All lectures are available for free on YouTube at cs50.ly/2d. To take the course for a certificate, register at cs50.edx.org/2d.
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CS50 @cs50.harvard.edu · 29/05/2026
Join us for a free, live, online series introducing the fundamentals of artificial intelligence (AI). This series is designed for anyone interested in better understanding how AI works and the ideas that make it possible. Sign up to attend any of the sessions via Zoom at cs50.harvard.edu/x/zoom/.
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CS50 @cs50.harvard.edu · 21/05/2026
What is your favorite 2D game of all time? 👾 Is it Super Mario Bros., Legend of Zelda, Angry Birds, Flappy Bird, Pokémon, Pong, Breakout, Match-3 or some other one? All CS50 2D lectures are available on YouTube at cs50.ly/2d. To take the course for a certificate, register at cs50.edx.org/2d.
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CS50 @cs50.harvard.edu · 11/05/2026
Professor David J. Malan @davidjmalan.bsky.social sits down with Ryan Peterman @ryanlpeterman.bsky.social of the Peterman Pod for a conversation about computer science and beyond, filmed in the Regent Theatre in Arlington, Massachusetts, home to the Fifty Foundation, and the team behind CS50.
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CS50 @cs50.harvard.edu · 08/05/2026
RESCHEDULED FOR MAY 18 - CS50’s next live Office Hours, led by Professor David J. Malan and CS50’s own Brian Yu, Carter Zenke, and Colton Ogden will take place on Monday, May 18 at 1pm EDT! Register for Zoom at cs50.ly/officehours
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CS50 @cs50.harvard.edu · 15/04/2026
If you find yourself in Las Vegas on Monday, April 20, join us for an “engaging, interactive, and entertaining discussion about how Professor David J. Malan and his team have created and are using AI as a personal tutor for his students.” 🦆 Tickets available at www.eventbrite.com/e/embracing-....
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CS50 @cs50.harvard.edu · 14/04/2026
Congrats to everyone who took part in this year’s CS50x Puzzle Day. 🧩 Here are the stats! Which puzzle was your favorite? Check out the solutions and memes at cs50.ly/puzzle-day-2026.
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CS50 @cs50.harvard.edu · 08/04/2026
Join us on Monday, April 13, at 12:30pm EDT for live Office Hours with Professor David J. Malan and CS50’s own Brian Yu to ask questions about Computer Science, Artificial Intelligence, CS50 itself, and beyond. Register for Zoom at cs50.ly/officehours.
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CS50 @cs50.harvard.edu · 02/04/2026
What was your favorite lecture from CS50 for Business? Comment below. 👇 The entire course is available on YouTube for free at cs50.ly/business. To take this course for a certificate, register at cs50.edx.org/business.
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CS50 @cs50.harvard.edu · 31/03/2026
This Friday, April 3, join CS50 for a Tech Talk on why you’re still better than AI at editing documents, led by Nick Bernal of SuperDoc.dev, starting at 1pm EDT. Register for Zoom at cs50.zoom.us/meeting/regi....
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CS50 @cs50.harvard.edu · 30/03/2026
Have you started CS50 for Business yet? This newest course from CS50 covers a broad range of topics, perfect for decision-makers of today and tomorrow. The entire course is available on YouTube for free at cs50.ly/business. To take this course for a certificate, register at cs50.edx.org/business.
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CS50 @cs50.harvard.edu · 27/03/2026
Can you solve ‘BananAnanagrams’ from last year’s CS50x Puzzle Day? For an interactive spreadsheet version of the puzzle, visit tinyurl.com/banananagrams. See cs50.ly/puzzle-day-2025 for the solution. Register for this year’s Puzzle Day at cs50.ly/register.
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CS50 @cs50.harvard.edu · 26/03/2026
Can you solve ‘Books’ from CS50x Puzzle Day 2024? See cs50.ly/puzzle-day-2024 for the solution. Register for this year’s Puzzle Day at cs50.ly/register.
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CS50 @cs50.harvard.edu · 25/03/2026
Can you solve ‘Around the World’ from last year’s Puzzle Day? See cs50.ly/puzzle-day-2025 for the solution. Register for this year’s Puzzle Day at cs50.ly/register.
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CS50 @cs50.harvard.edu · 07/03/2026
Hello, world! CS50x Puzzle Day starts anytime after 00:00 on Friday, April 3, and ends anytime before 23:59 on Monday, April 6, in your own time zone. Register at cs50.ly/register.
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CS50 @cs50.harvard.edu · 23/01/2026
Missed the launch of the new-and-improved CS50x 2026? 🧐 Not to worry! Enroll anytime at cs50.edx.org or watch the entire course on YouTube at cs50.ly/x2026. All your progress from last year will roll over!
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CS50 @cs50.harvard.edu · 26/12/2025
On January 1, 2026, we’re launching the new-and-improved version of CS50x on edx.org and CS50’s YouTube. A little sneak peek below!
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CS50 @cs50.harvard.edu · 17/11/2025
Live from Harvard University at 1:30pm EST with Professor David J. Malan, this is CS50's last lecture this year. Open to anyone online. This lecture will become part of CS50x 2026 on edX on January 1, 2026. On YouTube at youtube.com/live/NcBMUE1.... On Zoom at cs50.zoom.us/meeting/regi....
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CS50 @cs50.harvard.edu · 10/11/2025
Live from Harvard University at 1:30pm EST, this is Week 9 of CS50 on Flask. Open to anyone online. This lecture will become part of CS50x 2026 on edX on January 1, 2026. On YouTube at www.youtube.com/live/F8w1K3C.... On Zoom at cs50.zoom.us/meeting/regi....
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CS50 @cs50.harvard.edu · 03/11/2025
Live from Harvard University at 1:30pm EST, this is Week 8 of CS50 on HTML, CSS, JavaScript. Open to anyone online. This lecture will become part of CS50x 2026 on edX on January 1, 2026. On YouTube at youtube.com/live/gPCuN4W.... On Zoom at cs50.zoom.us/meeting/regi....
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CS50 @cs50.harvard.edu · 24/10/2025
Live from Harvard University at 12pm EDT, this is CS50's lecture on AI. Open to anyone online. This lecture will become part of CS50x 2026 on edX on January 1, 2026. On YouTube at youtube.com/live/yD1Y1ch.... On Zoom at cs50.zoom.us/meeting/regi....
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CS50 @cs50.harvard.edu · 20/10/2025
Live from Harvard University at 1:30pm EDT, this is Week 7 of CS50 on SQL and more. Open to anyone online. This lecture will become part of CS50x 2026 on edX on January 1, 2026. On YouTube at youtube.com/live/kaA8eKB.... On Zoom at cs50.zoom.us/meeting/regi....
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CS50 @cs50.harvard.edu · 08/10/2025
Live from Harvard University at 1:30pm EDT, this is Week 6 of CS50 on #Python. Open to anyone online. To attend in person some day, see cs50.ly/attend. On Zoom at cs50.zoom.us/meeting/regi.... On YouTube at youtube.com/live/KV2Nib7....
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CS50 @cs50.harvard.edu · 06/10/2025
🧩 The first-ever CS50x Puzzle Day in London is this Friday, October 10, 2025 at 5:00 PM British Summer Time, hosted at Meta by Professor David J. Malan, Professor Daniel Wilson, Professor Tom Crawford from Oxford, and CS50's alumni and friends at Meta.
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CS50 @cs50.harvard.edu · 06/10/2025
Live from Harvard University at 1:30pm EDT, this is Week 5 of CS50 on data structures and more. Open to anyone online. This lecture will become part of CS50x 2026 on edX on January 1, 2026. On YouTube at www.youtube.com/live/Sca41aX.... On Zoom at cs50.zoom.us/meeting/regi....
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CS50 @cs50.harvard.edu · 29/09/2025
Live from Harvard University, this is Week 4 of CS50 (on memory and more). Open to anyone online. This lecture will become part of CS50x 2026 on edX on January 1, 2026. On Zoom at cs50.zoom.us/meeting/regi.... On YouTube at youtube.com/live/aQFbviJ....
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CS50 @cs50.harvard.edu · 22/09/2025
Live from Harvard University at 1:30pm EDT, this is Week 3 of CS50 on algorithms. Open to anyone online. (Or attend in person some day, per cs50.ly/attend.) Watch on YouTube at youtube.com/live/4eN3_kb.... Register for Zoom at cs50.zoom.us/meeting/regi....
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CS50 @cs50.harvard.edu · 18/09/2025
CS50 is back in the United Kingdom! Join us at Meta in London on Friday, October 10, 2025, for a CS50x Puzzle Day with Oxford Lifelong Learning, University of Oxford.
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CS50 @cs50.harvard.edu · 15/09/2025
Live from Harvard University at 1:30pm EDT, this is Week 2 of CS50 on arrays and more. Open to anyone online. (Or attend in person some day, per cs50.ly/attend.) On YouTube at youtube.com/live/2Z-UFxZ.... On Zoom at cs50.zoom.us/meeting/regi....
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CS50 @cs50.harvard.edu · 08/09/2025
Live from Harvard University at 1:30pm EDT, this is Week 1 of CS50 on C. Open to anyone online. On YouTube at youtube.com/live/2Lg0W1_.... On Zoom at cs50.zoom.us/meeting/regi.... Or, to attend in person some day, see cs50.ly/attend.
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CS50 @cs50.harvard.edu · 18/08/2025
Hello, world! CS50's lectures in Sanders Theatre at Harvard University are open to the public, September 2025 – November 2025. Fall 2025's lectures will become part of CS50x 2026 on edX. To attend in person, visit cs50.ly/attend. To watch online instead, register at cs50.ly/watch. Schedule ↓
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CS50 @cs50.harvard.edu · 25/07/2025
Last week, we hosted this year's CS50 Educator Workshop. 🌎 Over two days, educators explored CS50’s teaching resources, heard from CS50’s own David J. Malan about the course's pedagogical decisions, and shared strategies for teaching computer science! ✏️
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CS50 @cs50.harvard.edu · 17/07/2025
This was the first-ever CS50 Hackathon at Meta in London 🇬🇧, with workshops on AI, Llama, Wearables, and Number Games by CS50’s own @davidjmalan.bsky.social and Rongxin Liu, Oxford’s own @tomrocksmaths.bsky.social, et al. 💻
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CS50 @cs50.harvard.edu · 11/07/2025
Last month, CS50’s team got together to say goodbye to Yuliia and Vlad. For the last two years, Yuliia has been CS50’s preceptor, helping manage CS50 both on campus and off, while Vlad worked on CS50's social media and video production. Wishing them all the best in their next chapters! 🚀
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CS50 @cs50.harvard.edu · 05/06/2025
Q: Will my real name or username appear on my certificate? A: For CS50 Certificates, we will ask you what name you wish to appear. For edX’s Verified Certificates, the name associated with your edX account will appear on your verified certificate. #FAQ50
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CS50 @cs50.harvard.edu · 02/06/2025
CS50 is back in the United Kingdom! Join us in London on Friday, June 20, 2025, for a CS50 Hackathon with the University of Oxford and Meta, with Professor David J. Malan from Harvard, Professor Daniel Wilson from Oxford, and Professor Tom Crawford from Oxford. www.eventbrite.com/e/cs50-hacka...
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CS50 @cs50.harvard.edu · 27/05/2025
"If you asked me about one of my most memorable moments at Harvard University, I would still immediately think of my very first lecture here. It happened to be CS50 – Introduction to Computer Science, held in the iconic Sanders Theatre...", by Inno '25. college.harvard.edu/.../my-favor...
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CS50 @cs50.harvard.edu · 22/05/2025
Do you know about the CS50 Manual?📘 A simplified version of C's "man pages" for functions frequently used in CS50. Whether you're just getting started or need a quick reference, it’s here to help. manual.cs50.io
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CS50 @cs50.harvard.edu · 20/05/2025
Did you get a free certificate prior and now want to upgrade to a verified one? If so, log into your edX account and purchase a verified certificate for that course. Then email your edX receipt to certificates@cs50.harvard.edu with the hashtag #upgrade in the subject line.
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CS50 @cs50.harvard.edu · 13/05/2025
Join us for a Q&A with Professor David J. Malan and CS50’s own Yuliia Zhukovets this Friday, May 16, at 11:30 AM EDT on CS50’s YouTube. Comment with your most pressing questions below! 👇
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CS50 @cs50.harvard.edu · 07/05/2025
This was Visitas 2025, a weekend during which future Harvard students visited campus and attended some of the exciting courses in store (CS50 among them!). 📸
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