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Play the sound I'm not so sure I want to go to the surface. What if the world finds out what we were doing down here?:

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Half-life is constant over the lifetime of an exponentially decaying quantity. It is a characteristic unit for the exponential decay equation. The original term, half-life period, dating to Ernest Rutherford's discovery of the principle in 1907, was shortened to half- life in the early 1950s. See also: Half-Life (video game), Half-Life 2, Half-Life (series), Half-Life: Alyx, Biological half-life, Characters of Half-Life,

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