Updated: 8:29 PM UTC, Jul 16, 2017

Drug Use Measured on Bills - You Probably Have Cocaine In Your Wallet

Sound outrageous? Not really! According to a recent scientific study, more than 90% of all US dollar bills present trace evidence of cocaine. The study of these bills will reveal consumption by geographic zones as cocaine is sometimes snorted with the assistance of bills.

Now I Know
769
I Knew it
437

What Causes Aches and Pains?

Contrary to public opinion, aches and pains are not caused by lactic acid: in fact they are caused by micro-muscular lesions, and the pain occurs as the white blood cells are hard at work repairing the damage. As these are primarily present at night, the pains often manifest themselves the following day.

Now I Know
1092
I Knew it
300

Your Hair Won't Grow Back Thicker or Faster After Shaving

Your hair won't grow back thicker, harder or faster when it is shaved. What gives this impression is that the hair is more rigid because it is shorter, and it itches because it is usually cut at an angle by the blade of the razor. It's only during adolescence that there is a change in the composition of the hair, making it harder.

Now I Know
1109
I Knew it
329

Does Knuckle-cracking Cause Osteoarthritis?

If you regularly "crack" your fingers, know that it will not cause osteoarthritis later in life. The cracking noise is caused by carbon dioxide bubbles found in the synovial fluid present in your joints. However, some scientists have stated that hand strength could be negatively affected in the long term.

Now I Know
735
I Knew it
522

An Episode Of Dr House Filmed With A Digital Camera

The last episode of season 6 of the series Dr. House was entirely shot with a digital camera, valued at $2,500. The goal was to prove that the quality of these devices was such that it was possible to shoot professional series with them, and was especially a big publicity stunt for the camera manufacturer, Canon. The device used was a Canon DSLR EOS 5D Mark II.

Now I Know
715
I Knew it
333

Book Covers Made Of Tanned Human Skin

In the eighteenth and nineteenth century, some books, mostly dealing with medicine, were bound with a cover made of tanned human skin, which usually came from people on the death row. Today, you can still find copies sold to collectors for a fortune.

Now I Know
1015
I Knew it
307

Do We Have To Wait A Few Hours After Eating to Swim?

When you were a child, you probably heard someone tell you to wait a few hours after eating to swim. Yet, It does not increase the risk of hydrocution (Immersion Syndrome) to go swimming right after a meal.

Now I Know
968
I Knew it
443

Vitamin C Doesn't Prevent Sleep Nor Helps Stay Awake

Contrary to popular belief, natural or synthetic vitamin C does not prevent from sleeping, even if taken at night just before going to bed. So, you can drink orange juice without worries! However, you should pay attention to certain chemical Vitamin C that are sold together with other components, such as caffeine, for example.

Now I Know
686
I Knew it
339

The Hidden Arrow Of The Famous FedEx Logo

The logo of the FedEx Company, specializing in rapid delivery of packages, has an arrow "hidden" between the E and the X of its name, symbolizing its activity.

Now I Know
624
I Knew it
423

The Funny Thing About The Newman Logo

The logo of the brand Newman Clothing seems classic at first glance, yet it has a funny feature: it's the same whether you look at it normally or if you rotate it at 180 °

Now I Know
698
I Knew it
356

Chanel No. 5 - Origin Of The Name Of This Fragrance

Chanel No. 5 perfume was named so because the French couturier Gabrielle "Coco" Chanel who, having a choice between ten bottles of different fragrances, set her choice on the bottle ... number five.

Now I Know
835
I Knew it
383

The Meaning Of The The Sports Brand Asics

The sports brand Asics is an acronym for the Latin phrase "Anima Sana In Corpore Sano". In English: A Healthy Mind In A Healthy Body".

Now I Know
874
I Knew it
364