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Half life?

Answer:

Either...
1. The time it takes half of the atoms of an isotope to decay.

2. One of the first 3D games, made by Valve, taking place in an underground research facility called Black Mesa. You play as a crowbar-wielding scientist, Gordon Freeman. You should play it, it's fun!

Contributor:

Andi

First answer by ID1658348559. Last edit by JovianMoons. Contributor trust: 0 [recommend contributor ]. Question popularity: 3 [recommend question].

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