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TIL in 1923, a dog named Bobbie was separated from his owners and lost. Six months later, Bobbie appeared on their doorstep mangy and scrawny with feet worn to the bone; he walked over 2500 miles (4000 km) of plains, desert and mountains an average of approximately 14 miles (23 km) per day.

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J1PQ1 TIL the term "port" to refer to a ship's lefthand side was for centuries much less common than the term "larboard", which only fell out of favor in the mid-1800s once the British Navy ordered its usage abandoned due to sounding too similar to "starboard".
evMn TIL trains are terrible at going uphill. The steepest incline in England is 1.5° and trains need additional engines pushing in the back to help climb it.
r0y0 TIL: In olden times, homes had thatched roofs in which domestic animals such as cats and dogs would like to hide. In heavy rain, the animals would either be washed out of the thatch, or rapidly abandon it for better shelter, so it would seem to be raining cats and dogs
0w76y TIL Bluejays feathers aren't actually blue! Instead the pigment in their feathers (melanin) is brown and we perseve it as blue. Natures trickery.
1nJd TIL According to a 1996 study, 80% of homophobic subjects and 34% of non-homophobic subjects became aroused when shown gay porn. The study used 64 self-reported straight males.