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A "Half-Life" is not half of a life, it is half of the life, then half of that life, and then half of THAT life, and so on and so on. For example:

Rock has a half life of 100 ---> 50 ---> 25 ---> 12.5 ---> 6.25 ---> and so on. You just keep dividing the life it has, by 2.

Another Example:

If you take a dissolving vitamin, and weigh it (20g), and put it in water for 1 minute, it should dissolve into ALMOST half of its original weight, into 10g.

Scientists often use the method of "Half-Life" to measure the age of a rock or rock formation.

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