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wikipedia.org
mx4Po
TIL German airplanes “Stuka” did not make that screaming sound when diving because of their engine , but because they had small fans attached to the front of their landing gear that acted as siren. This will “weaken enemy morale and enhance the intimidation of dive-bombing”
v1Vbx
TIL that the Hydrangea flower color changes based on the pH in soil. Soil with a pH of 5.5 or lower will sprout blue hydrangeas, a ph of 6.5 or higher will produce pink hydrangeas, and soil in between 5.5 and 6.5 will have purple hydrangeas
D1pKr
TIL about the "Sad Nipple Syndrome", a biological condition of some women that would feel an intense sense of sadness when their nipples are touched.