Submitted: Apr 2, 2008 - Neil Armstrong may have been the first man on the moon, but he wouldn't have gotten there without fruit flies, rhesus monkeys or a dog. Who are the unsung heroes of space exploration?

What many people don't know are the special sacrifices that had to be made in order to get astronauts up into space at all. The major unsung heroes of space exploration, it turns out, are animals.

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