A GOOD PLACE TO BEGIN
A visual field guide to the ideas shaping our digital world. Start with a question; leave with a little more wonder.
Follow a curated trail through the big ideas, one satisfying step at a time.
Try a computer science challenge, open a hint, and learn why the answer works.
Computers only understand 0s and 1s. Click the bits to flip them. Each bit is worth double the one on its right, and the ones that are ON add up to the number.
Sorting is one of the most studied problems in computer science. Pick an algorithm and watch how it puts the bars in order.
The Caesar cipher hides a message by shifting every letter along the alphabet. It is one of the oldest encryption methods and is said to have been used by Julius Caesar.
Top row: the letter you type. Bottom row: what it turns into.
Challenge: switch to Decrypt, use a shift of 3, and decode Khoor Zruog.