1) Unlike in the movies, for the most part members of the military do not salute indoors or on battlefields or in combat zones.

2) About people racking shotguns or racking the slides on guns in movies: if you have to rack a weapon, the chamber was empty before! So that means in all these dramatic scenes where someone is in grave danger and holding a weapon, if they have to rack before the pull the trigger, the weapon prior to that was not functional.

3) The word “cool” – meaning detached smoothness – first started being used in that sense in the 16th century.

4) All tea varieties – black, green, white &c. – are produced from the same species, Camellia sinensis. They are just processed differently.

5) Airplane’s black boxes are orange.

6) Most bacterial infections of the skin that people identify as “spider bites” were not caused by spiders, as spiders do not commonly bite humans.

7) Many etymologies of words, even those found in dictionaries, are little better than codified urban legends.

8) Cabbage, broccoli, cauliflower, kale, Brussels sprouts, collard greens, savoy, kohlrabi and Chinese kale are all cultivars of the same plant, Brassica oleracea.

9) Humanity very likely experienced a population bottleneck in the Late Paleolithic during which the population may have been as low as 2,000 individuals.

10) If the solar system could be filled with air (same as earth’s atmospheric composition) out to Neptune at the density of atmosphere on earth at sea level, and if it could somehow be made not collapse, it would still be a black hole with only that density.