Navy. BGM-109 Tomahawk was developed by General Dynamics and is produced by Raytheon.

Apollo 8. Apollo 8 was the first human spaceflight to leave the orbit of the Earth.

Cetaceans. "Cetus" is a Latin word that means "large sea animal".

Jerry Yang. Yahoo! shares trade under the letters YHOO on the NASDAQ.

Clavicle. The clavicle is one of the most commonly broken bones as a result of sports injury.

Hepatitis B. Hepatitis B is 100 times more contagious than HIV.