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TIL that 100,000 years ago, at least three major rivers existed in Sahara

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yMDa TIL if you cut off a ring of bark around a tree trunk, the tree will die
NXwlQ TIL about the "invisible wall," an anomaly where workers encountered a strange "invisible wall" in the area under a fast-moving sheet of electrically charged polypropelene film in a factory. This "invisible wall" was strong enough to prevent humans from passing through.
yQAJX TIL John Ross Bowie, who played the reoccurring role of Kripke, on "The Big Bang Theory" also is a film critic, who wrote a whole book on the movie "Heathers".
yQPQX TIL a guy in Canada built an underground nuclear fallout shelter out of 42 school buses encased in dirt and concrete.
4Xmga TIL... The dumbo octopus looks like the Disney elephant and uses it's ear-like flaps to swim.