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TIL of Santimamiñe Cave located in province of Biscay, Spain.It was discovered in 1916. Inside there's mural paintings of bison, ibex & bear from Mesolithic era. It was designated as World Heritage Site by UNESCO in 2008.

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R7Zj8 TIL President Warren G. Harding held birthday parties for his dog Laddie Boy where he would invite neighborhood dogs and serve dog biscuit cakes to guests. A statue of Laddie Boy was made out of 19,134 pennies after the President’s death.
695NJ TIL That in response to a lawsuit, hackers from the Anonymous group took PlayStation network offline for 23 days and leaked the creditcard informations of 77 million users
QNk56 TIL Earthquakes leave heat signatures. Friction from large earthquakes can heat the slip zone over 1000 degree Celsius higher than the surrounding rock leaving behind glass-like pseudotachylytes which can be used to estimate the energy of the event.
YpJNd TIL that bilinguals experience tip-of-the-tongue moments twice as often as monolinguals. Processing two languages at the same time comes with a computational cost. Although, this kind of “multitasking” trains the brain.
ADwa7 TIL that there are ciphers on UK postal boxes that show the reign of a Monarch of when the pillar box was established in the area.