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Roll clouds are a type of arcus clouds are typically associated with thunderstorms. These rarities of nature occur when air temperatures invert and cause the warm air to be on top of the cool air. The wind then changes speed and direction and causes a rolling effect of these cylinder-type clouds.

yVG08 TIL that In 1315, King Louis X passed a decree that abolished slavery and proclaimed that "France signifies freedom". The decree entailed that any slave setting foot on French ground should be freed
L7nP TIL There’s a 300-page book called ‘A Void’ that was written without ever using the letter “e”. The original is French but there are over a dozen versions in different languages written by translators who also managed to compose them without using the most common letter of the alphabet.
WkMmd TIL ... All non herbal teas (white, green, black, oolong, pu-erh, etc.) come from the same plant Camellia sinesis. Though different varietals in the plant have developed among different regions, teas from the same region only differ by oxidation and not the leaf itself.
1aa7O TIL that the Catholic Church specifically taught that indulgences do not affect whether or not a person goes to heaven. However, greedy "pardoners" lied about this and promised things like eternal salvation in return for money to increase donations. This led to Martin Luther's 95 Theses.
pYAYZ TIL that no smoking signs became mandatory in airplane lavatories after a fire on Varig Flight 820 killed all but one passenger by carbon monoxide poisoning and smoke inhalation.