A whale that was found dead on a beach in New Zealand earlier this month has been identified by scientists as a spade-toothed whale, a species so rare it has never been seen alive. Researchers say the carcass discovery could help them acquire crucial new information about the species.

Also, how tornadoes are formed remains one of nature's biggest mysteries. What can we learn from the scientists who are chasing twisters to unlock the secrets of destructive storms?