<ul><li>The oldest known tree, 'Methuselah,' is a bristlecone pine in California estimated to be over 4,800 years old.</li><li>The human stomach regenerates its lining every 3 to 4 days to prevent self-digestion from the strong acids inside.</li><li>The Mariana Trench's Challenger Deep, with a depth of about 36,000 feet, could fit Mount Everest completely submerged.</li><li>Wood frogs can freeze solid in winter and survive, thanks to their ability to produce antifreeze-like chemicals.</li></ul>

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