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TIL We Might Have a Negative Leap Second. If UTC−UT1 (Figure 4) continues downward past −0.5 then we might need to have a minute with only 59 seconds for the first time ever. "We are almost as likely as not to experience a negative leap second in the next 12 years."

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YX6r TIL that since 1977 Nikon every year holds a photomicrography competition. Here are all the winners and honorable mentions!
8avp8 TIL Many Hanna-Barbera characters had collars in order to make them easier (and cheaper) to animate. Redrawing only their heads in each frame when they spoke.
gMwl8 TIL The NES game 'Who Framed Roger Rabbit' included a real phone number that players could call and hear a recording of Jessica Rabbit offering hints. The phone line was discontinued by 1990 and reassigned to a sex hotline some time before 2010. The original recording has since been lost.
loOYK TIL in 1988 the final history exams for more than 53 million Soviet schoolchildren were cancelled because much of the history they had been taught were lies.
v6R4 TIL that scientists once tested the intelligence of beavers by playing the sound of running water on a field. Eventually, the beavers began covering the tape player with branches and mud.