What are the ten systems of the human body?

All the organs and processes of the human body belong in one of ten anatomical categories. They are (in alphabetical order): Circulatory, Digestive, Endocrine, Excretory, Integumentary (skin), Muscular, Nervous, Reproductive, Respiratory, and Skeletal

Months that begin on a Sunday will always have a Friday the 13th."

Should you be rude in Tibet?

By U.S. customs, perhaps so! In the country of Tibet, it's good manners to stick out your tongue at your guests.

"A 95-mile-long underground river flows beneath Mexico."

Everyone knows about vitamins A, B, C, D, and E. Few are aware that there are also vitamins K, T, H, and U. These vitamins are helpful in proper liver function, treating anemia, and the healing of ulcers.

What vice-president killed a man in a duel?

Vice President Aaron Burr killed Alexander Hamilton in a duel. The two men had a long history of conflict. Because Hamilton had accepted the challenge to a duel and the "rules" of the duel were followed, Burr was not indicted for murder. He completed his term as vice president, but later was charged with treason in another matter.

In some countries, like Mexico and Spain, Friday the 13th is actually considered a lucky day."

The longest fingernails ever recorded measured a total of 29 feet and 10 inches."

How do chicks know when to break out of their shells?

At a certain point, the membrane that acts as a lung is no longer able to handle the growing chick's demands for oxygen. At that point, carbon dioxide begins to build up in the shell, causing a sharp twitch in the hatching muscle in the bird's neck. The chick's head repeatedly jerks back, causing its beak to crack the shell

What's the difference between a thunderstorm and a supercell?

Supercells are similar to other thunderstorms, except they're bigger, stronger, and meaner. While a strong thunderstorm, associated with a passing cold front, may produce a tornado, supercells can produce several tornadoes. One of the things that separates supercells from the "ordinary" thunderstorms is that violent updrafts and downdrafts reinforce each other, which allows a supercell to be sustained for an hour or more

How did Noxema get its name?

Noxema, the skin cream invented in 1914 by Baltimore pharmacist George Bunting, was originally sold as "Dr. Bunting's Sunburn Remedy." Mr. Bunting changed the name to Noxema after a customer enthusiastically told him the cream had "knocked out his eczema." Thus, the cream that "knocks eczema" became "Noxema".

Cats see in color, so your new paisley frock in orange, purple, and yellow won’t be lost on them. They also have fantastic night vision, and only need one-sixth of the light humans require to see. So don’t go getting your cat night-vision goggles.

How can you tell if someone is lying?

Lies are usually manifested by these signs: a sudden increase in the number of "ums" and "ahs," being overly defensive, and no eye contact. Since lying is stressful, they will try to be sarcastic, turning their body away from you, talking fast, making statements that contradict each other, unusual body language or a hand reaching to cover the mouth

What did Teddy have against Christmas trees?

Theodore Roosevelt, a staunch conservationist, banned Christmas trees in his home, even when he lived in the White House. His children, however, smuggled them into their bedrooms