What is Gravity?
Description: Why aren't we floating right now? Gravity, of course! But it's not that simple...
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
Can you name that president? This quiz game will put your U.S. Presidential trivia knowledge to the test. You will be given a picture of a United States President and four names to pick from in multiple choice format. Identity the U.S. President correctly to score a point. Answer all 20 questions to get your final score. How many presidents can you name?