What happens to the tears of crying astronauts?

Astronaut Chris Hadfield has used his webcam - and growing international audience - to demonstrate what happens to tears in space.

"Your eyes will definitely cry in space, but the difference is: tears don't fall," he shows, using a growing pool of water that sticks to his eye and cheek.

The International Space Station commander has been tweeting and posting photos and videos since blasting into space in December.

See more from Commander Hadfield

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