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TIL that a Roman Mile was defined as 1,000 paces. Armies would leave mile markers every 1,000 steps as they marched; as a result, well-fed armies marching at a fast pace marked longer miles.

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x6M1w TIL in 1900, Los Angeles, the city now known for its car culture, had a 14 km wooden bike superhighway connecting it with Pasadena, Daily ridership was around 1,500. It was dismantled a decade later and the land was used for the Arroyo Seco Parkway, one of the oldest expressways in the country.
JkZv TIL a clinical trial in 2016 held at Stanford University School of Medicine found that injecting modified human stem cells directly into the brains of chronic stroke patients can re-enable patients to walk.
JYaRl TIL the largest tumor successfully removed from a human patient was a multicystic mass of the right ovary weighing 303 lbs (137.6 kg). The 6-hour operation took place in 1991 at Stanford University Hospital where the patient lay on her side, so as not to be crushed by the 3-ft diameter growth.
G5m1 TIL In the U.S, a 2007–2008 survey showed that dog-owning households outnumbered those owning cats, but that the total number of pet cats was higher than that of dogs. The same was true for 2009–2010.
Av0g TIL of anesthesia awareness, a condition in which a patient under anesthesia is completely conscious yet unable to physically move their body. Patients are fully aware for the entirety of their operation and are able to feel pain without the ability to alert the doctors to stop the procedure.