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And the next one here is DNA. DNA is last up to 50,000 years. Scientists, for a while now, they're trying to get samples of DNA from very, very old bones and fossils and things they've been finding, trying to see how much of it is actually viable, or at least some signature from them. It gives them the idea of what the animals' evolutionary tracing tend to look like. And scientists have been able to extract DNA from a 50,000 year old tooth that belonged to an African antelope. If you'd like to join us, you have a comment, come on in, and we'll get into this one.