A program that you can talk to.
How can you drop a raw egg from 10 feet in the air onto a concrete floor without cracking it?
And actually concrete floors are pretty hard to crack
If it took eight men ten hours to build a wall, how long would it take four men to build it?
Yes.
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Why couldn't the woman wear her new necklace?
http://upload.wikimedia.org/wikipedia/commons/thumb/d/db/Positronium.svg/200px-Positronium.svg.png
Why did the chicken cross the highway?