Parenting 101 v15 - Girls

When I am confronted with a difficult parenting situation, I'll put the issue out there to plumb the depths of the vast parenting knowledge of my beloved readers....Here is our fifteenth edition of Parenting 101.
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Lukas' understanding of the world is increasing by the minute. He's learning to read and discovering many wonderful things. His questions are much different than before. Some things still don't make sense to him. For example, the other day at the supper table Lukas asked:

Why do girls have long finger nails?

I couldn't think of a good answer. Any ideas?