This Week: Ancient water = ancient habitat?
In the News: Accidents: Why Do They Happen?
Are we affecting the character of future generations by the way we choose mates? If choosing attractive mates tends to make the grandchildren more attractive, what about choosing mates who like to laugh or have fun?
Classroom Activity Page: The fossil of a plesiosaur, which was a large, dangerous predator of the seas between 200 and 85 million years ago, showed strong evidence of being pregnant. Evidence for pregnancy included the location of the unborn plesiosaur, its size, and the fact that its bones were not fully hardened, or ossified. The find helps flesh out the evolutionary transition between laying eggs and live birth.
How does momma croc know when to dig up the young? How do the embryos know when to start hatching? The secret’s in the song…
Minute sand dollar larvae, tasty morsels in a sea of famished fish, have a clever way to help ensure their genes are passed to the next generation.
In 1997, Dolly was BIG NEWS. What did Dolly teach? Why did cloning attract so many oddballs, and what is the status of reproductive cloning and therapeutic cloning? The Why Files honors Dolly with a 10-year lookback.