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No one is entirely sure. Water has high surface tension, yet the molecules at its surface are unstable, which makes the air-surface interface mysterious and difficult to describe. Satoshi Nihonyanagi, a researcher at a molecular-spectroscopy lab in Japan, studies water and its surface—"specifically probing the interface," he calls it—using isotopically diluted H2O, which doesn't vibrate and is easier to observe. He's found that some water molecules are bound to others by a single hydrogen bond.

xnNb TIL Henry Beresford, 3rd Marquess of Waterford got drunk with his cronies, wrecked a small town in Ireland, painted it red (literally), beat up a few cops and painted them red too. Thus the term painting the town red was created.
nWw7G TIL to flush a horses tear duct in their eyes, the vet syringe the solution through their nostril, not their eyeball.
RJ87 TIL German soldiers can disobey orders if they consider them to be inhumane
X0LDR TIL the Belgian passport has pictures of Tintin, The Smurfs and Lucky Luke.
XELDk TIL in 2012, 1,000 Americans across all income levels were surveyed and it was found 45 percent said the holiday season brings them so much financial pressure, they would prefer to skip it altogether.