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.

Submersible. A submersible is sometimes called a "midget submarine".

Momentum. Velocity, displacement, momentum, force and acceleration are vectors.

7. The star "Alkaid" is at the end of the "handle" in the Big Dipper.