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TIL human eye colors technically only range from dark brown to light brown. Blue, green, and hazel eyes are only perceived based on lighting conditions and the structure of the eye, using a very similar physical principle to Raleigh Scattering, which makes the sky look blue.

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EgkoV TIL the term "Hollaback Girl" was coined by supermodel Naomi Campbell. Producer Pharrell Williams overhead a conversation Campbell had where she said, "I'm sorry, I have a name. I ain't no Holla Back girl", apparently referencing the women in the music video for "Young'n (Holla Back)" by Fabulous
wLg4M TIL about substitute teachers’ week. Every year in Alberta, Canada the Alberta Teachers’ Association dedicates a week to recognizing the work of substitute teachers.
WkOEY TIL Turkey granted women full political rights before many other nations. Founder of Turkey Atatürk said:"There is no logical explanation for the political disenfranchisement of women. Any hesitation and negative mentality on this subject is nothing more than a fading social phenomenon of the past."
QboM TIL Allstate’s “Mr. Mayhem” Dean Winters has survived 17 surgeries and 9 amputations, including his nose and thumb, and also died for 2.5 minutes en route to the hospital.
wLB78 TIL when your immune system fights an infection, it cranks up the mutation rate during antibody production by a factor of 1,000,000, and then has them compete with each other. This natural selection process creates highly specific antibodies for the virus.