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TIL Bee's deposit a small positive electric charge on each flower they visit. They also posses "Electroreception" which allows them to detect the presence of electric fields on flowers. They use this info to know if a flower has been recently visited by another bee and therefore has less nectar.

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4Vyg TIL that traditional Japanese units of time were of unequal length, to accommodate the variation in daylight as the seasons changed. They also created mechanical clocks that varied in the same way.
xVM1B TIL China has a history of using underage athletes in Gymnastics in the Olympics
W79n9 TIL 1 of 2 German V1 rockets in the US is located at the courthouse in Putnam County, IN. After WWII, a local resident working in arms disposal thought it a shame to dispose of the relic, and had it placed in his hometown. It is now a memorial for local veterans who lost their lives during the war.
oBlRL TIL that some plants can recognize preying caterpillars by their chewing sounds and then activate chemical defenses. When sounds were played without the caterpillar being present, the plants chemical response was identical.
yDRv TIL: While attempting to gather blood for testing from a frozen mammoth the blood was found in ice cavities. When the cavities were broken the blood came running out.