Khan Academy
Khan Academy: The History of Everything Ted
David Christian gives a TED talk covering the Universe's 13.8 billion year history in 18 minutes.
Khan Academy
Khan Academy: Newton's Law of Gravitation: Gravity for Astronauts in Orbit
Video lecture explains why astronauts appear weightless despite being near the Earth. [7:12]
Khan Academy
Khan Academy: Gravity for Astronauts in Orbit
Why do astronauts appear weightless despite being near the Earth? Sal Khan answers this question in this video. [7:11]
Khan Academy
Khan Academy: Deriving Displacement as Function of Time, Accel, Initial Velocity
Sal Khan discusses deriving displacement as a function of time, constant acceleration, and initial velocity in this video. [9:57]
Khan Academy
Khan Academy: Mass and Weight Clarification
Sal Khan explains the difference between mass and weight. [10:40]
The Kid Should See This
Tksst: The Hammer Feather Drop in the World's Biggest Vacuum Chamber
Brian Cox visits NASA's Space Power Facility to demonstrate what happens when a bowling ball and a feather are dropped together under the conditions of space. [4:41]