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TIL: "Noctural penile tumescence" refers to men having erections during the REM phase of sleep. Observation of this can help doctors diagnose erectile dysfunction: if the penis gets erect during sleep, the patient's problem is likely psychological and not a problem of blood flow.

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9gY7 TIL there is a Native American tribe in Mexico that are known to be able to run up to 430 miles without stopping.
XEDYR TIL of "Zero", a soccer stadium in Brazil in which the midfield line is aligned with the Equator - zero latitude, which makes each team defending one hemisphere.
R50Pl TIL Nearly three-quarters of Pennsylvania residential telephone service in 1943 was party line, with users encouraged to limit calls to five minutes (as neigjbors / other subscribers could listen to your calls).
D1E5j TIL that the National flag of Nepal is the only non-quadrilateral national flag in the world.
v10K TIL The Cash family blocked Preparation H from using Ring of Fire in what could have been their best commercial ever.