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TIL that the Fatebenefratelli Hospital in Rome pretending jews had a highly contagious disease called 'Syndrome K' to keep them safe from Anti-Semitic laws when the Nazis occupied Northern Italy.

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MbK TIL that the price of Gasoline in the US is half of the average price in the EU
ZXnG TIL Stephen Hawking pulled out of conference in Israel hosted by president Shimon Peres in protest at treatment of Palestinians
9YGJp TIL the British Secret Service used semen as invisible ink during WW1, but stopped the practice later on because of the smell
vPVg8 TIL Glass can be spun into wool - soft like cotton, safe to the touch, and also bio-soluble (non-toxic in general). The fiberglass wool is usually used as house insulation and is resistant to mold. A 2'x4' batt of recycled fiberglass insulation is roughly equivalent to 15 recycled glass bottles.
7r7rO TIL in Scandinavia the Kiruna to Narvik electrified railway carries iron ore down a steeply graded route. On the way down the trains generate large amounts of electricity by regenerative braking, which is sufficient to power the empty trains back up the track and pump excess energy into the grid.