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TIL that the phrase "tug at your heartstrings" has some scientific validity, because the heartstrings are actual vital parts of the heart. The medical term for them is the chordae tendineae, and they play an integral role in controlling blood flow within the heart.

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R7Op8 TIL that the mountain K2 (the 2nd highest in the world) was named such as a placeholder, literally "the 2nd peak in the Karakoram mountain range". it stuck because the mountain is so remote that no one else had given it a name.
nNnd TIL Steve Buscemi was a New York City fire fighter from 1980 to 1984. After the events of 9/11, he showed up in NYC to volunteer, working twelve-hour shifts for a week, and digging through rubble with his old comrades looking for missing firefighters.
4XLo5 TIL that, according to Rotten Tomatoes, the three best Pixar films are the Toy Story trilogy. The three worst are the Cars trilogy.
bNAQ TIL Due to an error with PayPal, a man was credited with 92 trillion dollars making him briefly the richest man ever. For reference, all money owned by every person and country in the world only totals 199 trillion.
6yxm TIL that the U.S. Army has a list of approved laundry detergents. These detergents do not contain optical whiting compounds, which would cause laundered uniforms to glow in UV light, and stick out in night-vision imaging.