/r/askscience
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How do we still have radioactive particles on earth despite the short length of their half lives and the relatively long time they have been on earth?
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How does water get hot enough to evaporate and form clouds? It needs to get at least 100°C and that seems tough, especially in the winter.
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When plotting exoplanet discoveries with x being semi-major axis and y being planet mass, they form three distinct groups. Why is this?
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When a water filter (e.g. Brita filter) is past its expiration date, is it just not filtering very well anymore, or is it actively making the water worse?
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