CS50

This is Lecture 6 of CS50 for Business on Weaving the Web. Learn the fundamentals of web development with HTML, CSS, and JavaScript, languages with which you (or someone else!) can build modern, interactive websites. To take this course for a certificate, register at cs50.edx.org/business. youtu.be/O3jwILfJXkY

This is Lecture 5 of CS50 for Business on Implementing the Internet. Explore how the internet works from the ground up, including protocols like IP, TCP, DNS, and HTTP, plus modern scaling with cloud computing and virtualization. To take this course for a certificate, register at cs50.edx.org/business. youtu.be/pjDtNVZXRHo

This is Lecture 4 of CS50 for Business on Approaching Artificial Intelligence. Explore the fundamentals of artificial intelligence, including game playing algorithms, reinforcement learning, neural networks, and natural language processing. To take this course for a certificate, register at cs50.edx.org/business. youtu.be/pFq5szYIWQk

This is Lecture 3 of CS50 for Business on Practicing Programming. Learn fundamentals of Python programming with practical examples of functions, conditionals, loops, data types, libraries, and real-world applications. To take this course for a certificate, register at cs50.edx.org/business. youtu.be/_UE0BW-2dYk

This is Lecture 2 of CS50 for Business on Designing Data Structures. Explore the essentials of data structures, such as arrays, linked lists, trees, and hash tables, and understand their trade-offs for efficient memory use and algorithm performance. To take this course for a certificate, register at cs50.edx.org/business. youtu.be/-kKf1U6KuGk

This is Lecture 1 (the second!) of CS50 for Business on Analyzing Algorithms. Learn how to analyze and optimize algorithms for searching and sorting with in-depth explanations of time complexities and practical examples. To take this course for a certificate, register at cs50.edx.org/business. youtu.be/fFzWME39Mag

This is Lecture 0 (the very first!) of @CS50 for Business, in which you'll learn all about Interpreting Information. Discover the fundamentals of computer science, from binary data to algorithms, and learn how technology processes information to solve real-world problems efficiently. To take this course for a certificate, register at cs50.edx.org/business. youtu.be/pWPHa4FL264

CS50 is back with a new-and-improved course, Computer Science for Business! This 9-lecture series is designed specifically for business professionals, managers, founders, and decision-makers. Tune in every day on @CS50’s YouTube at 9:00 am ET starting tomorrow. To take this course for a certificate, register at cs50.edx.org/business. And for now — a word of introduction from Professor @davidjmalan. youtu.be/tT9VMlXRkwE

Have you registered for CS50x Puzzle Day 2026 yet? It 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. Learn more about Puzzle Day from Professor @davidjmalan. 👇

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. CS50x Puzzle Day is an online adaptation of an event we hold at Harvard each year, an opportunity to collaborate on a team with classmates, family, friends, students, and colleagues on a packet of puzzles (i.e., logic problems). The event is open to everyone around the world, whether taking CS50 or not. No prior CS experience required. Teams of size 2, 3, or 4 are encouraged, or you can participate on your own. Teachers are welcome to host their own version during class. See cs50.ly/puzzle-day-2025 for a summary of last year’s CS50x Puzzle Day as well as some past puzzles for practice. Indeed, the best way to practice for this year is to solve past puzzles first!

"In this episode, we explore Professor @davidjmalan's journey into computer science, why discovering a subject later can be a strength, and how curiosity often matters more than credentials. We talk openly about imposter syndrome, the role of struggle in real learning, and what education should protect in an age of AI. Along the way, Prof. Malan reflects on the power of computer science to turn people from consumers into creators, and the responsibility educators have as technology continues to evolve." With Yash Shah of @imperialcollege. youtube.com/watch?v=EgEL3d…

You're invited... a @CS50 lecture on #AI with Prof. @davidjmalan in Seattle, Washington, USA, on Thursday, February 12, 2026, 5:45pm to 8:30pm PST. "Please join us for an in-person look at how CS50 has incorporated Artificial Intelligence (AI), including its new-and-improved rubber duck debugger, and how it has impacted the course already. CS50 is Harvard University's introduction to the intellectual enterprises of computer science and the art of programming, freely available as OpenCourseWare, with more than 7M registrants on @edXOnline and 2.2M subscribers on @YouTube." Register to attend in person (only) at eventbrite.com/e/using-ai-as-…. #education #community

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!

Now live on @edXOnline, this is CS50x 2026, @CS50's (free) introduction to the intellectual enterprises of computer science and the art of programming, including AI. Open to anyone online. Register at cs50.edx.org. #education #community

Live at 00:00 UTC, this is CS50x 2026... youtube.com/watch?v=UuIEbp… #education #community

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!

Happy holidays from Professor @davidjmalan and @CS50’s whole team here in Cambridge. 🎁 Stay tuned for release of CS50x 2026 on January 1, 2026.

Tune in to @CS50’s YouTube channel to watch interviews from the CS50 Fair. You’ll see students at @Harvard present their final projects. And you'll perhaps be inspired for a project of your own! 💫 youtu.be/R8BeK0ZnYOU

This is CS50x 2026 with @davidjmalan, @CS50's (free) introduction to the intellectual enterprises of computer science and the art of programming, now with artificial intelligence (AI). 🦆 Full season available on @edXOnline on January 1, 2026. Register at cs50.edx.org. #education #community #stranger #things

A very happy Thanksgiving from (and to!) @CS50’s whole team at @harvard, @OxLifelongLearn, and beyond! 🧡🍂🥧 Artwork by Sophie Anderson. #education #community #thanksgiving