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TIL human eye colors technically only range from dark brown to light brown. Blue, green, and hazel eyes are only perceived based on lighting conditions and the structure of the eye, using a very similar physical principle to Raleigh Scattering, which makes the sky look blue.

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Z8JKa TIL that police officers tap the rear of your vehicle with their hand when performing a traffic stop so that if anything were to happen to the officer during the encounter, there would be physical evidence of them coming into contact with your vehicle via fingerprints.
6ER5X TIL male show dogs can't be fixed and a judge needs to feel his testicles to make sure they're present and are equal size. A male dog failing to show a healthy pair of testicles will be disqualified. Sometimes a dog's testicles retract during inspection and its handler must coax them back down.
Wkg6L TIL that a suspected serial killer was shot dead by a sex worker when he entered her home. 4 sets of handcuffs were found on him. When police searched his car, they found a machete, axes, knives, a shovel, bleach, and garbage bags, a sledgehammer, and a bullet proof vest.
D1xeg TIL when filming the Wolf of Wall Street, they brought in a real lion and the used cgi to remove the handler and add the office workers
JY181 Did you wake up today with a craving for clay, or dirt? That’s called pica, an abnormal craving for substances other than typical food. If you went ahead and acted on your impulse, it's probably a good idea to head over to your doctor’s office. Research indicates that in most cases this craving is a result of a mineral or vitamin deficiency. This brings us to this week’s Today I Learned, as National Geographic Society grantee and ornithologist Luke Powell explains why macaws regularly munch on South American rain forest clay. Yummy! All animals (including humans) need salt to live. Animals that live in the Amazon rain forest face a curious predicament due to the way the Andes mountain range affects weather coming from the Pacific Ocean. This geography results in an extreme lack of salt in the Amazon and, consequentially, some unique behaviors and appetites.EDITOR: Laurence AlexanderSERIES PRODUCER: Chris Mattle