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TIL humans can't actually smell metal. Instead, whenever we touch metals it is a reaction between oils on our skin and the metals which we are smelling.

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via reddit.com

4X1GN TIL a Chinese teen visiting Egypt in 2013 prompted outrage when he wrote his name on the wall of an ancient monument. He carved 'Ding Jinhao was here' in Chinese into the wall of 3,500 year old Luxor Temple.
vPLJK TIL soviet aircraft aren't actually named things like "Fishbed" or "flanker" by the soviets, just translated. Instead, these are designations invented by NATO for easier communication between troops. First letter refers to class of aircraft, syllable count indicates jet versus propeller driven.
Eg08P TIL that the NBC sitcom Suddenly Susan was the result of the network being impressed by Brooke Shields's guest appearance on Friends as Erika, Joey's stalker.
gMwX9 TIL The Turkey Drop is when a freshman college student comes home for Thanksgiving and is unceremoniously dumped by his high school girlfriend or boyfriend.
NnYb TIL of Martin Pistorious, a man who fell into a coma as a young boy. 2 years into his 12 year vegetative state his conscience was awakened. He was trapped for 10 years in his body, unable to communicate, with only his thoughts for company.