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TIL that an estimated 10-20% of young women in industrialized countries have a contact allergy to nickel

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neWn7 The most popular artificial material on Earth isn’t steel, plastic, or aluminum — it’s concrete. Thousands of years ago, we used it to build civilizations, but then our knowledge of how to make it was lost. Here’s how we discovered concrete, forgot it, and then finally cracked the mystery of what makes it so strong.
V8wZ TIL that Norman Greenbaum has made a living off the royalties of exactly one song: “Spirit in the Sky.”
8aw8G TIL the US Navy uses Xbox controllers to control their submarine periscopes.
OogM7 TIL 25% of Spongebob Squarepants viewers are adults with no children.
LW0v TIL crows are quite similar to humans and visit their aging parents many years after they have left the nest