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TIL that over 60% of global iron reserves and most of the iron ore currently mined were created by precambrian bacteria. These cyanobacteria caused the Great Oxygenation Event, where free oxygen became much more common on Earth. Some of this oxygen combined with iron to form banded iron formations.

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dD8mE TIL that before Geronimo ever learned how to properly use a rifle, he would run at armed enemies in a zig-zag pattern until he was close enough to use his knife. He claimed that the mountain spirits spoke to him and said, "You will never die in battle, nor... by gun. I will guide your arrows.”
b9GKZ TIL the San Francisco font was created by Susan Kare for Apple Macintosh computers in 1984 and originally mimicked the "ransom-note effect" (juxtaposed typefaces that appear as if words or letters were cut randomly from magazines). It was used in early Mac software demos and Apple company fliers.
OGkJ4 TIL that Pink Floyd’s The Wall is designed as an endless loop. The final track, “Outside the Wall,” ends with “Isn’t this where...”, and the album starts with “... we came in?” continuing the last song’s melody, highlighting the cyclical theme of Water’s concept.
XkJX TIL President Abraham Lincoln feared the long term effects of unrestrained corporations and capitalism that “play on the prejudice of the people” more than the effects of the civil war.
nVW9 TIL that in 2009, if the total wealth of American citizens was distributed evenly to every person, everyone’s annual income would be approximately $177,700.