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TIL fire burns faster uphill. For every 10˚ slope, the fire will double its speed. For example, if a fire is travelling at 5 km per hour along flat ground and it hits a 10˚ slope it will double in speed to 10 km per hour up the hill.

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kJ5Ye TIL that during WWII, Ford's mile-long ‘Willow Run Liberator Bomber Assembly Line” produced B-24’s at a rate of one every hour. A symbol of American wartime industrial might, it exemplified how industry (and millions of women) pivoted to support the war effort, a vital part of the Allied victory:
xAYb TIL the oldest family business that still exists is a Japanese construction company founded in the year 578.
kOG9W TIL one of the reasons American bullfrogs are so dangerous as invasive species is cannibalism. Adult bullfrogs can subsist entirely off tadpoles and younger frogs (which eat algae and insects), and that reliable food source lets adult populations grow beyond what's normally possible in an ecosystem
LQygV TIL about a refrigerator in the 1920s co-designed by Albert Einstein for the poor. The Einstein–Szilard or Einstein refrigerator is an absorption refrigerator which has no moving parts, operates at constant pressure, and requires only a heat source to operate.
YpxYv TIL that in the last days of WW1, the Germans blew up all the French factories, bridges and railways they could and flooded the mines in France's most industrial area. This was the reason why France asked reparations from Germany, French economy needed that to survive after what the Germans had done