Instructional Video
Crash Course

Crash Course Computer Science #1: Early Computing

9th - 10th
This video focuses on the early efforts of computing. Welcome to Crash Course Computer Science! Today, we're going to take a look at computing's origins, because even though our digital computers are relatively new, the need for...
Instructional Video
Crash Course

Crash Course Computer Science #2: Electronic Computing

9th - 10th
This video focuses on electronic computing. So we ended last episode at the start of the 20th century with special purpose computing devices such as Herman Hollerith's tabulating machines. But as the scale of human civilization continued...
Instructional Video
Khan Academy

Khan Academy: Binary & Data

9th - 10th
Adafruit founder Limor Fried and program manager Federico Gomez Suarez explain how computers represent numbers, text, images, and sound using tiny electric signals.
Instructional Video
Khan Academy

Khan Academy: Primality Test Challenge

9th - 10th
How can a machine tell us if a number is prime?