Proof that girls are evil:
First, girls need time and money: Girl = Time ⋅ Money {\displaystyle {\mbox{Girl}}={\mbox{Time}}\cdot {\mbox{Money}}\,}
And we know that time is money: Girl = Money ⋅ Money {\displaystyle {\mbox{Girl}}={\mbox{Money}}\cdot {\mbox{Money}}\,}
We also know that money is the root of all evil: Money = Evil {\displaystyle {\mbox{Money}}={\sqrt {\mbox{Evil}}}\,}
Therefore: Money 2 = Evil {\displaystyle {\mbox{Money}}^{2}={\mbox{Evil}}\,}
So we are forced to conclude that: Girl = Evil {\displaystyle {\mbox{Girl}}={\mbox{Evil}}\,}