NIH Calling for Teenage Guinea Pigs! But No Boys Need Apply.

Hmmm.....don't boys go through puberty?

I got this postcard in the mail the other day. Hmm....enrolling girls only. Don't boys have brains? Don't they go through puberty? My suspicious mind immediately went to the big question -- WHAT ARE THEY REALLY AFTER? 

Here's the back side of the card.