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TIL that of the 5000 or so species of mammals on the planet only female humans have permanent breasts.

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QJXBd TIL Red hair occurs naturally in 1-2% of the human population. However, In Ireland, the percentage of population with red hair is estimated to be around 10%, making it the world’s highest concentrated population of red heads.
GYwRG TIL when Philip Glass was composing Music in Twelve Parts, he only finished the first part as he intended for it to be played by 12 musicians; but when a friend took a listen and asked what the other 11 parts was gonna be like, Glass went on to compose the other parts as a challenge.
4kX85 TIL Pavlov's dog experiment was widely misunderstood because of mistranslation and misconstruction. Pavlov never used a bell to condition dogs to salivate, because a bell was an imprecise control. Instead he used tones, duration of tones and electric shock to study physiological reflexes.
ZWjQ TIL there is a soap opera filmed entirely without authorization inside an IKEA.
WkpYN TIL that Natalie Portman speaks Hebrew(native), English, French, German, Spanish and Japanese. As a student, she co-authored two research papers that were published in scientific journals.