Oil has higher viscosity than water, ethanol is even lower than water.
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Liquid helium is the least viscous liquid known to man, with a viscosity that is even lower than that of water at room temperature. It exhibits superfluidity at temperatures close to absolute zero, where it flows without any viscosity.
Viscosity basically talks about how runny something is. Low viscosity means that it's really runny.
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Liquid hydrogen is the coldest substance known to man, minus 400 degrees
Noble gases like helium, neon, and argon are considered the least reactive substances known to man. They have full outer electron shells which makes them very stable and unreactive under normal conditions.
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There are currently 118 known elements in the periodic table.