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TIL the format of the Lincoln–Douglas debates. One candidate spoke for 60 minutes. Then the other candidate spoke for 90 minutes. Then the first candidate was allowed a 30-minute reply.

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ANL7a TIL hippos can defecate into rivers so much that their feces builds up and kills fish through hypoxia, or lack of oxygen. In the Mara River, about 4,000 hippos poop out more than 9 tons of dung each day. Hippo feces also leaves behind chemicals such as ammonium and sulfide, which is harmful to fish.
NwG6 TIL that the Hindenburg airship was said to be so stable that a pen or pencil could be stood on a table without falling. Its launches were so smooth that passengers often missed them, believing that the airship was still docked to its mooring mast.
neWo9 National Geographic explorer and grantee Gregg Treinish wants everyone to know about the hidden toxic cost of synthetic fabrics. Tiny, invisible microplastics are entering our waterways straight from our washing machines. About 2,000 synthetic particles are released from washing a single polyester fleece jacket. All clothing items—including cotton and wool—shed micro-fibers when washed, but the natural fibers biodegrade. Synthetic particles don't degrade and can absorb toxins while traveling through the waterways. If they're eaten by small organisms, such as fish, they can bioaccumulate and end up on our dinner plates. Read more about how you can minimize microplastics' impact on the environmentMore from Gregg TreinishClick here to read more about microplastics in the ocean
R7ZD9 TIL of William Pitsenbarger who had over 250 rescue missions during the Vietnam War and is just one of six enlisted recipients of the USAF to receive the Medal of Honor.
woDdY TIL that during the Battle of Trafalgar, only one ship was destroyed (the Achille on the Franco-Spanish side) through direct combat via a fire that reached the magazine, causing an explosion. While the British were able to capture 17 enemy ships without losing any of their ships during the battle.