Pin Number - ATM pins were originally supposed to have six digits. The inventor changed it to four digits, however, because his wife claimed she could only remember that many numbers.

Matches - You would think matches were invented before lighters, right? It only makes logical sense. Wrong. Lighters were made before matches.

Padlock Hole - Have you ever wondered why there's a hole on the bottom of padlocks? Well, it's there tolet water drain out of the lock when it's being used outdoors. This way, the lock won't rust from rain or freeze from cold weather.

T-shirt - Originally invented all the way back in 1904for bachelors who didn't have a wife or any sewing skills.

Chocolate Medicine - Chocolate milk nowadays is a beverage we enjoy simply for its delicious taste. But did you know that it was originally sold as medicine by its Irish physician inventor?

Wine and Champagne Bottle Indentations - The indentations on the bottom of wine and champagnebottles are there to help evenly distribute the pressure of the contents inside the bottle.

Germs - Wearing a ring can be more unsanitary than you think. The number of germs living beneaththe ring you're wearing could be equivalent to the entire population of Europe, which is about 730 million.

Salting Pineapple - Although it sounds weird, adding salt to a pineapple makes it taste sweeter. Don't knock it until you try it.

Gross Office Desk - It's time to start wiping down your office desk more often. The average office desk has over 400 times more bacteria than an average toilet.

Directional Travel - If you keep going north, at one point you'll eventually end up going south. If you keep going east, however, you'll never end up west.

Barcode Readers - Did you know that barcode readers read the white parts and not the black? Thereaders work by emitting rays of light onto the barcode and having the white parts reflect it back.

Chocolate Chip Cookie - Ruth Graves, the inventor of the Toll House chocolate chip cookie, sold the idea and her recipe to Nestle in exchange for a lifetime supply of chocolate. Sounds fair enough, right?

Zipper Injuries - These injuries happen more often than you think. To be exact, approximately 20,000 folks go to the ER each year for these zipper-involved genital injuries.

Barbie's Last Name - Not only does Barbie have a last name, but a middle name as well. Her full name is Barbara Millicent Roberts.

Chainsaws - These were originally invented to serve as a surgical instrument for assisting in childbirth. It was used in symphysiotomy, a procedure that widens the pelvis (ouch).

Bee Orgasm - The male honey bee solely exists to mate with the queen bee. Once the male bee has an orgasm, his testicle explodes and he dies.

Pig Orgasm - Human orgasms differ in lengths of time but on average they last a few seconds to maybe a few minutes. But did you know a pig's orgasm can last for 30 minutes?

Quite revealing