How can you throw a ball as hard as you can and have it come back to you, even if it doesn't bounce off anything? There is nothing attached to it, and no one else catches or throws it back to you.
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You throw the ball straight up into the air, and gravity brings it down each time
on May 29, 2017
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What HAMSTERVAMPIRE said, or my version: throw it hard enough to go around the entire Earth.
on May 31, 2017
on May 31, 2017