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TIL that the quality of a woman’s voice fluctuates through the course of her menstrual cycle with the “best voice” (higher pitch) during the ovulatory phase & “worst” during the premenstrual phase which is referred to as “premenstrual voice syndrome.”

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9YKd6 TIL The native, undomesticated variety of the avocado is known as a criollo, it's small, has dark black skin, contains a large seed. It probably coevolved with extinct megafauna. The avocado tree has a long history of cultivation in Central and South America, likely beginning as early as 5,000 BCE.
kOdNg TIL Willem Kolff created the first dialysis machine in the Netherlands during WWII. Lacking materials, he used sausage casings, tin cans, a washing machine, and salt water. He also saved more than 800 people from the Nazis by hiding them in his hospital. And he later invented the artificial heart.
jL6p TIL an optimized road trip stopping at a major landmark in most of Europe would take roughly 14 days of driving to complete
YpmWA TIL the painting "The Scream" was painted with a red sky accurately depicting the Norwegian sky at the time caused by the eruption of the Krakatoa volcano in Indonesia.
mxVER TIL Fire hydrants are colored differently because of different water pressures.