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TIL that the grading system used by schools in the United States is A, B, C, D, or F because teachers were concerned that students and parents would think "E" stood for "Excellent" in an A, B, C, D, E system.

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wLPLM TIL about the bradycardic response, a phenomenon where infants, when submerged in water, reflexively hold their breath as their heart rate slows and any water ingested is directed to the stomach. This reflex disappears around 6 months of age.
g19A TIL A tall, red-haired European looking mummy that was 3000 years old was found in China
4kMMX TIL that the British tenor, Alfie Boe, got his big break while he was an apprentice mechanic. He enjoyed singing opera arias while he polished the cars, and one day was overheard by a client with connections in the music industry who suggested he should audition for an opera company.
gMokX TIL of a plant known as the "Suicide plant" (also called Gympie-Gympie) which is common in the north-eastern rainforests of Australia. Brief contact with its silica-tipped hairs can penetrate the skin causing extremely painful stinging which has been said to last from months to years
nArd TIL an ox is just a steer (or bull) that has been trained to pull a plow, not a separate species from cattle (cows).