Rudder. The space shuttle's rudder acted as a brake by opening to the left and right like a book.

Geographer. The astrolabe was used around 200 B.C. by Greek astronomers.

Jupiter. The temperature on Jupiter is -185.5 degree F.

Payload. "Useful load fraction" is the combined weight of the payload and the fuel.

Arm. Roots help provide support by anchoring the plant and absorbing water and nutrients needed for growth.

Perrier. Perrier is owned by the Nestle Corporation.