Re:Teeth Whitening and the Hygiene Hypothesis
by coldtea on Sunday August 02, 2015 @02:26PM
(#9991734)
What bizzaro math are these?
First of all, 10X is not a factor of age! "X" was meant as an arbitrary monetary unit, and the cost is the same 10X for both the kid and the 90 year old.
Second, "returning the investment" doesn't mean "reaching 100 years old". It just means "getting more years of life for the same cost".
Even if the boy lived only to 30 or 40, he still lived 20 or 30 years, whereas for the 90 year old living up to 100 or 110 would be extremely rare.
First of all, 10X is not a factor of age! "X" was meant as an arbitrary monetary unit, and the cost is the same 10X for both the kid and the 90 year old.
Second, "returning the investment" doesn't mean "reaching 100 years old". It just means "getting more years of life for the same cost".
Even if the boy lived only to 30 or 40, he still lived 20 or 30 years, whereas for the 90 year old living up to 100 or 110 would be extremely rare.