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TIL: Phoenix streets reach 160°F during the summer, which can cause thermal burns

Read more jpl.nasa.gov

via reddit.com

WkM5B TIL that 71 percent of Americans age 17 to 24 are ineligible to join the military, primarily because they are too overweight or too poorly educated, or they have a record of serious crime or drug abuse.
ZQWv TIL When “Persia” became “Iran” in 1935, The suggestion for the change is said to have come from the Iranian ambassador to Germany, who came under the influence of the Nazis. The name Iran means land of the Aryans.
Me8L8 TIL that falling asleep during summer or in hot environments is harder because our body temperature lowers 1 to 2 degrees when we sleep. An optimal room temperature for falling asleep is around 18.3°C or 65°F.
GYj8Q TIL Samurai’s would do the infamous haircut of shaving the top of their head and keep the back long otherwise known as “Chonmage” in order to keep them cool while fighting in the humid months but also to still keep their helmet secure on their head with the hair in the back.
NX0VE TIL that mantis shrimps have 16 color-receptive cones in their eyes, compared to just 3 in humans, giving them the ability to see a vast array of colors. They possess one of the fastest punches in the animal kingdom. They can strike with the speed of a .22 caliber bullet.