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TIL that the Blue Whale's major arteries and veins are so large that a small child can pass through them.

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0ww1j TIL that Roman concrete, subject to marine corrosion, has stood for over 2000 years, while modern cement can break down in as few as 50 years. The concrete the Romans used contained volcanic ash and got stronger over time: the ash was slowly replaced with Al-tobermorite, a rare hydrothermal mineral.
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