Flying. The fear of flying gets more attention than most phobias because air travel is difficult to avoid.

Ulnar Nerve. Striking the ulnar nerve at the elbow where it is unprotected by muscle or bone causes the "funny bone" tingling.

25. A cup of raw vegetables contains 5 grams of carbohydrates and 2 grams of protein.

Inner Ear. The structures in the inner ear that help with balance are the semicircular canals and the otolith organs.

Farsightedness. The cause of hyperopia is usually genetic.

Hit To The Head. Mild traumatic brain injury (MTBI) is another term for concussion.