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TIL the word “biceps” is singular (and thus “bicep” is grammatically incorrect). The plural form of “biceps” is “bicepses” (emphasis on the first syllable).

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rNaXx TIL of the COMEX Hydra VIII experiment, where a team of professional divers dived to a depth of 536 m/1,752 ft while breathing Hydreliox, breathing gas consisting of 49% hydrogen, 50.2% helium and 0.8% oxygen
QNVVe TIL that long term chronic recreational ketamine use is associated with a reduction in grey matter, a decline in cognitive function and bladder inflammation
kO1g7 TIL that Costa Rica does not have traditional street addresses, but instead use distances from landmarks to guide taxis, guests, mail etc.
145r TIL that the Church of Christian Science promotes illness as an illusion that can be cured through prayer alone.
m1POo TIL, in Bhutan, people do not recognize, and many do not know, their individual birthdays. Everyone in the country turns another year older together each January 1st.