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TIL According to a study, children that have been exposed to family violence show much of the same brain activity as soldiers that have been in combat.

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WkPN8 TIL the first sports bra was made in 1977 by sewing two jock straps together. Its literal test run was performed by of its two inventors: one jogging forwards wearing the Macgyvered prototype while her friend ran ahead, jogging backwards so she could assess her friend's "bounciness"
e0LJk TIL about one in every 1500 people have something called Voluntarily Piloerection - the ability to consciously give themselves goosebumps. The phenomenon both perplexes and intrigues neurophysiologists by defying conventional understanding of how the unconscious nervous system operates.
R7xe4 TIL that Obskaya–Bovanenkovo Line is the most northerly railway in the world
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
0w4OM TIL that there's a species of spider that breathes air, but lives its entire life underwater in diving bells made of spider silk