Girls are Evil

Proof: Girls are the root of all evil.

If girls require time _and_ money, should that be stated: Girls = Time + Money

This leaves us with, using the well-known fact that time is money: Girls = 2*Money

Under the assumption that money is the root of all evil, it can now be found that: Girls = 2*sqrt(evil)

In words, girls are _twice_ the root of all evil, instead of just evil