The half-life of a certain element is 100 days. How many half-lives will it be before only one-eighth of this element remains?
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3 half lives.

Explanation:

Half life = 100 Days

Start Point M = 64

End Point M = 8

Need M = M/8

2^3 = 8

So 3 half lives

T = 0

M = 64

T = 100

M = 32

T = 200

M = 16

T = 300

M = 8

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.