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Health experts say they're not yet sure about the level of immunity people may have after recovering from COVID-19.

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89Qa TIL the History Channel Aliens guy used to be a bodybuilding promoter.
Merd8 TIL Showman and businessman PT Barnum was frustrated with how long people lingered in his museum’s exhibits. He posted signs that said 'This Way to the Egress'. He knew most of the visitors would follow them not knowing 'Egress' meant 'Exit'. They couldn’t re-enter without paying the entry fee again
Med5B TIL in 1848, Phineas Gage had an accident where a 43inch iron rod pierced through his cheek and came out of his skull. He survived mostly unscathed but he became a completely different person, going from a hardworking, pleasant man to a surly, aggressive alcoholic who was unable to hold down a job.
D14YP TIL The Canadian military has developed a stealth snowmobile that is able to switch to "silent mode" for covert special ops missions in the Arctic
aMmZ TIL that in 2011, two men para-glided from the summit of Mt. Everest, arriving at a village in 42min and avoiding the dangerous conventional 3 day descent.