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TIL that Tolstoy and Gandhi were pen pals for years

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XaK8 TIL that learned helplessness means that if, over the course of your life, you have experienced crushing defeat or pummeling abuse or loss of control, you learn over time there is no escape, and if escape is offered, you will not act – you become a nihilist who trusts futility above optimism.
0bk5 TIL of a man who spent almost 70 years of his life with 2D vision. It wasn’t until he watched the movie Hugo with 3D glasses that his view of the world permanently changed, becoming able to see the world in 3D.
9Y9Lm TIL Apple's policy of refusing to repair phones that have undergone "unauthorized" repairs is illegal in Australia due to their right to repair law.
9JZ6 TIL that on Saint Patrick’s Day began as a “feast day” in honor of the anniversary of the day he died. To honor him, Christians could put aside their Lenten restrictions on food and alcohol consumption on this day, which is why excessive drinking has become so permanently linked to the celebration.
Ok87 TIL Swiss company Credentis developed a peptide that repairs & strengthens teeth, removing the need for drilling and fillings. The final product is called Curodont, and is currently available in Europe.