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.

Ganymede. Ganymede is the largest satellite and seventh moon of Jupiter.