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69M1J TIL darker skin people need more sunlight to make vitamin D. One experiment where a light skinned person was in sunlight for 8 hours saw their vitamin D concentration go up by 50x while a dark skinned person saw no change. They needed 5-10 times the sunlight length and then only saw a 30x change.
p8nA8 TIL that in 1922 a suitcase containing almost everything the young Ernest Hemingway had written up to that time was stolen in a train station in Paris. No trace of this suitcase has ever been discovered, despite the fact that the unpublished stories it contained would be incredibly valuable.