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TIL there is a Chinese conceptual artist named Liu Bolin who specializes in making himself invisible in everyday surroundings.

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V4QD TIL that claims of people being anal probed by aliens only became common after 1969, the year that colonoscopies were introduced. In 1989 there was a huge upsurge in anal probe reports as a result of the procedure becoming more widespread and Ronald Reagan undergoing one
vPmPL TIL that expensive weddings are directly linked to higher divorce rates.
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
OoEGe TIL about Reita Faria, the first Asian to win Miss World. A 66 to 1 longshot (people used to bet on beuty pageants), she won because of her then unique ambition to become a medical doctor.
N7N1J TIL that in the 70s, Fort Lauderdale, Florida, tried creating its own artificial coral reef by dumping some 2 million used tires into the ocean. It became an environmental disaster, naturally, but also a military training exercise when divers had to retrieve the tires (almost one by one).