5 Ridiculously Awesome NCIS: Los Angeles Facts - "Fallout"

According to the Center for Disease Control, Cobalt-60 is used in radiation therapy. It is a hard, gray-blue metal that resembles iron or nickel.

The vibrations heard are actual Morse code for "Case in Ops."

"Oorah," the Marine battle cry, was originally a Comanche war-cry that translates to "all-right" or "let's go!"

Payphones were invented by William Gray in 1889. They operated on the honor system for nearly ten years before they were switched to a coin-op system. Payphones were an essential part of communication in the 20th century; and at their peak, there were over 2.5 million in the U.S.

LA's first subterranean transit system was a short stretch of tunneling dubbed the "Hollywood Subway," which moved its first passengers under the city in 1925 via electric interurban rail cars.

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