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TIL: About Rock cairns and why the National park service recommends that you do not use them as a guide for hikes

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via reddit.com

e0JQg TIL that in the year 774 a "red crucifix" was seen in the sky, after sunset. This was likely caused by an extremely powerful solar flare. If a similar flare hit the earth today, modern human civilization could collapse due to wide spread power outages and damage to the power infrastructure.
LkVjV TIL The briefcase in Pulp Fiction originally contained diamonds but that was deemed too predictable so it was decided that the contents were never to be seen. This way each audience member would fill in the blank with their own contents.
pYw74 TIL that in 1493 Christopher Columbus first discovered Pineapple in Guadeloupe. By the 1700’s it was being imported to the American Colonies as well and could cost someone as much as $8,000 of today’s US dollars.
dDk6K TIL that Tetris can be used to prevent post-traumatic stress symptoms
18QO TIL that the Colorado Dept. of Transportation replaced mile marker 420 east of Denver with a marker that reads 419.99 to prevent theft.