› added 11 years ago

116

TIL that besides déjà vu, there is also jamais vu (a familiar situation that is not recognized), presque vu (the feeling of being on the verge of an epiphany), and déjà entendu (feeling certain you’ve already heard something).

Read more wikipedia.org

via reddit.com

XkyE TIL in 1965, 25% of all black households in the US were headed by women. By 2010, that figure reached 72%.
D1a4v TIL lightning can heat the surrounding air to as hot as 50,000 °F, three time hotter than the surface of the sun. As the super heated air cools, it produces a particular vacuum. The rapid contraction and expansion of this air is what causes thunder.
6ENR8 Fiber lasers mean ray guns are coming.
awwyo Pyrocumulus clouds tower tall above a wildfire in these photos taken last week from an Oregon National Guard F-15C. Most cumulus clouds form when the sun-warmed surface heats air, causing it to rise and carry moisture upward where it condenses to form clouds. In pyrocumulus clouds, the driving heat is supplied by a forest fire or volcanic eruption. The hot, rising air carries smoke and soot particles upward, where they become nucleation sites for condensation. Pyrocumulus clouds can be especially turbulent, and the gusting winds they produce can exacerbate wildfires. In some cases, the clouds can even develop into a pyrocumulonimbus thunderstorm with rain and lightning.
xkj0 TIL In 1945, Japanese radar operators detected a small number of incoming US planes (which carried the nuclear bombs to be dropped on Hiroshima and Nagasaki), but decided not to intercept them as the small number of planes were not seen as a threat.