Henry Cavendish
Description: Henry Cavendish was the first scientist to test gravity in the laboratory. Thanks to the "Cavendish Experiment," we know how much Earth weighs!
Category: Janet's Planet
Note: This video streams on an HTML5 player. It runs on Chrome, Firefox, Opera, Safari or Internet Explorer 9 or higher. It is also optimized for iOS devices, including iPad, iPod, and iPhone.
Game Spotlight
The World's Hardest Game is back in this all new sequel and it's even harder than the first one! Work your way through 50 incredibly difficult levels. Are you up to the challenge?