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TIL Gray wolves were reintroduced into Yellowstone National Park in 1995, resulting in regeneration of the entire ecosystem [Trophic cascade]. After the wolves were driven extinct regionally nearly 100 years ago, scientists began to fully understand their role in the food web as a keystone species.

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X0Oxj TIL in 1915 a farmer saw his sister make her own mascara with coal and petrolium jelly and thought he could make a better product. His invention was easier to apply and won't burn a woman's eye. He named his new company Maybelline after his sister Maybel and the base material Vasaline.
QJDxk TIL of Lewis Fry Richardson. He derived many of the complex equations needed for weather prediction in the 1920's. However, the math was so difficult that to predict the weather six hours in advance, it took him six weeks to do the calculations.
rRBOw TIL Emirates Airlines had an exclusive terminal in Dubai airport, which was the largest building in the world when opened in 2008. It's still worlds largest airport terminal.
kjxe TIL that during WWII A. Wald proposed the seemingly illogical idea of reinforcing the undamaged areas of US bomber and not the damaged areas. The holes represented areas where a bomber could take hits and still return home whereas the areas untouched, if hit, would cause the plane to be lost.
woxPP TIL UFO sightings date back to ancient Rome: in 218 BCE, during the Punic Wars, ‘phantom ships’ were reportedly seen in the sky near Rome; in 76 BCE, Pliny the Elder recorded a story of a ‘spark’ that fell from the sky, increased in size, and then returned to the heavens