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TIL Saudi Arabia promotes practice of marriage between close relatives which has produced high level of several genetic disorder including thalassemia, sickle cell anemia, spinal muscular atrophy, deafness and muteness.

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VGM4 TIL that 1 in 200 US births are to mothers who report that they have never had sex. Relative to “non-virgin” mothers not only do these mothers report lower communication from their parents about sex/contraception, but they were also younger and more likely to have signed chastity pledges.
Bgxve TIL of Miyake events, rare bursts of cosmic radiation that create spikes in C14 detectable in tree rings.
ADoPo TIL Star Trek's training exercise Kobayashi Maru has been used by computer security educators to teach students to think like an adversary, that by stepping outside the rules of the game one can redefine the game, and why you should teach your students to cheat.
v1Vdj TIL: Ireland held Tailteann mass marriages where couples were allowed to wed and be married for a year to see if they were fit for each other. They could divorce by proceeding to the so called “separation hills” without leaving a mark on their reputation. This was legal until the 13th century.
gMjwD TIL in 1857 Senator James Hammond, representative of South Carolina, released a manual of breastfeeding rules for enslaved women. The manual regulated time spent breastfeeding and rigidly set weaning schedules. The women were forced to nurse the children of their owners as well as other babies.