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TIL the BIPM doesn't use a physical rod that's exactly 1 metre similar to the physical "Kilogram" specimen, instead use concise measurement of light & time defined in 1984 by the CGPM as the distance light travels, in a vacuum, in 1/299,792,458 secs with time measured by a cesium-133 atomic clock.

Read more physics.nist.gov

via reddit.com

kDjW TIL in baseball, a left-handed specialist is a relief pitcher who throws left-handed and specializes in pitching to left-handed batters. They frequently enjoy long careers since their pitching arm suffers less stress.
4kMag TIL the Yangtze River in China dumps so much sediment into the ocean that it dyes coastal waters brown. In the winter, ocean currents stir up deposited sediment on the seabed extending the color even further out to sea.
rNna0 TIL the interesting number paradox, which suggests that if we classify natural numbers as "interesting" or "uninteresting," a contradiction arises: the smallest uninteresting number becomes interesting simply by being the smallest in its set. This implies that every natural number is interesting.
VBmDm TIL that The Dead Zone, in which Christopher Walken, the clairvoyant protagonist, attempts and fails to assassinate a presidential candidate with a rifle at a campaign rally, was written by Stephen King.
le41 TIL In 2009, Stanford MBA students were given $5 and told the generate as much revenue as possible. Some teams bought lottery tickets or used slot machines but the winning team made $650 by selling its presentation slot to a small local company