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When paleontologist Mary Schweitzer found soft tissue in a Tyrannosaurus rex fossil, her discovery raised an obvious question -- how the tissue could have survived so long?The bone was 68 million years old, and conventional wisdom about fossilization is that all soft tissue, from blood to brains, decomposes.Only hard parts, like bones and teeth, can become fossils.But for some people, the discovery raised a different question.How do scientists know the bones are really 68 million years old?

If there are too many or too few neutrons, the atom is unstable, and it sheds particles until its nucleus reaches a stable state.Think of the nucleus as a pyramid of building blocks.If you try to add extra blocks to the sides pyramid, they may stay put for a while, but they'll eventually fall away.The same is true if you take a block away from one of the pyramid's sides, making the rest unstable.Eventually, some of the blocks can fall away, leaving a smaller, more stable structure.

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