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TIL the "jellyfish effect" (or "space jellyfish") is when a rocket's high-altitude exhaust plume is illuminated by sunlight before dawn or after dusk

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6Ekrm TIL that there are elections in North Korea, on election day, everyone aged 17 and up is legally obliged to show up to vote. Once it is your turn to vote, you are given a ballot paper with just one name on it, nothing to fill in or cross out, you just take the paper and stick in a ballot box.
rNYjo TIL that Neanderthal DNA makes up roughly 1.8% of Asian genomes, 1.7% of European genomes, and 0.5% of African genomes
1nGd TIL: Gypsy is actually short for Egyptian.
m1pnE TIL: A newer study about marital issues contradicts a previous laboratory study which concluded that money is not a frequent source of marital conflict. Using real world data from parents in schools, churches, etc, money was the main source of marital conflict and had a big effect on relationships.
GYaej TIL: Queen's university's Medical School banned black medical students in 1918 and did not consider black applicants until 1965. The ban, however, was not officially removed until 2018.