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TIL donating a pint of blood is equivalent to donating a chocolate bar calorie-wise, mainly from the regeneration of 2 TRILLION red blood cells in bone marrow at a rate of 2 million/sec.

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9rBG TIL Grapefruit Juice can interact dangerously with a number of medications.
epeVk TIL that Urdu was made the national language of Pakistan at independence even though only 5% of Pakistanis spoke the language. Even today, while Urdu is widely spoken and understood, it is only the native tongue of around 5% of the population.
EL9d TIL that theoretical physicist Max Planck was told not to get into the field by his physics professor because “in this field, almost everything is already discovered.” He did so anyway and originated Quantum Theory which revolutionized the field.
wZl6 TIL during the Cold War, the C.I.A. made a pornographic video featuring a lookalike of the Indonesian President in an attempt to discredit him, including the designing of a full-face mask resembling the President
B4oL TIL In Ireland, in the county of Donegal there is a village called Muff. Muff is the location of one of the oldest and most successful diving clubs in Ireland.