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What is gravity Answer? Nobody knows. But this is as close an explanation as we have. Courtesy of Minute Physics YouTube. 1 minute 4 Star
A nice demonstrate/analogy Bending spacetime using latex. YouTube. 10 minutes and 23 million views! 4 Star
Is there gravity in space? veratasium YouTube. 1 minute 3 Star
Gravity and orbits Notice that the direction of the gravitational force is perpindicular to the direction of motion. Notice also that the gravitational forces acting on each mass are equa and opposite. From Phet. 4 Star
Visualize the gravitational force that two objects exert on each other. Change properties of the objects in order to see how it changes the gravity force. From Phet. 4 Star
Neil de Grasse Tyson on Newton inventing calculus: "Then he turned 26". YouTube. 2 minutes  
A video clip on measuring the gravitational constant (big G): Nice experiment in that it doesn't give a perfect answer so it's more like real science! 4 Star
The Cavendish Experiment link YouTube from Sixty Symbols 2 minutes 4 Star
Evangelical Scientists Refute Gravity With New 'Intelligent Falling' Theory 5 Star
Why are astronauts weightless? Short answer - they're not. YouTube 4 mins 4 Star
Why doesn't the space shuttle fall to Earth? Cool explanation. Youtube. one minute 5 Star
Another viewpoint This time from an astronomer. Youtube. Two minutes 4 Star
What's it like to experience weightlessness? An astronaut gives his experience. Youtube. 3 minutes 4 Star
How do they go the toilet? You know you want to know. Youtube. 2 minutes 4 Star
What happens when you wring a washcloth in space? Youtube. 3 minutes 5 Star
feather and hammer drop on the moon Youtube. 2 minutes. Poor quality 3 Star
Brianiac try it as only they can Youtube. 3 minutes 4 Star
Why zero-gravity bowling will never catch on Cartoon 3 Star
Astronomy Links
Landing on the moon - did you know this was all faked? From Youtube - quality isn't great. 30 seconds 4 Star
First walk on the moon - the BBC's "On this day" page includes link to Nixon talking about it, plus a link to peoples opinions 4 Star
Gravity – water balloon in space - video clip What happens when you pop a water balloon in space? Only one way to find out. But take a guess in advance anyway! From Youtube 3 Star