A bowling revolution: Modeling the perfect conditions for a strike Conditions from the makeup of the oil on the lane to the subtle asymmetry of a bowling ball can enhance planning for the next ...

A perfect number is the sum of its proper factors such as 6 = 3 + 2 + 1 or 28 = 14 + 7 + 4 + 2 + 1. All known perfect numbers are even.