Primate[r]: A member of the biological order Primates, which includes prosimians (galagos, lorises, lemurs and tarsiers), monkeys, apes, and humans. [e]
Coal mining[r]: the various methods used to extract coal from the ground. [e]
American Civil War[r]: {1861-65) war by the U.S. to prevent 11 of its states (the Confederate States of America) from seceding; won by the U.S. after the death of 600,000 people and the abolishment of slavery. [e]