Unusual rocks and minerals are fun to collect, but when you stumble upon a rock formation that looks like a Muppet, that's extra special. Check out this blue agate. When split in half, it looks a lot ...

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The organic molecules could come from life or from ordinary chemistry — only samples returned to Earth can settle it.

There might’ve been life on Mars after all. Although it resembles a coral typically found at the bottom of the ocean, it was a piece of rock that a NASA spacecraft — Curiosity rover — recently ...

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