At last, the answer you have been waiting for

If you ever wondered how a dolphin does that cute pirouette when
it jumps out of the water, some scientists have figured it out.
It used to be thought the tail flipping when they were already in
the air lets them spin, but NO! Here is the link:
http://sciencenow.sciencemag.org/cgi/content/full/2006/202/2