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TIL unprotected sex with an HIV-positive person who has acute HIV infection could carry a transmission risk of up to 2% (the equivalent of 1 transmission per 50 exposures) for receptive vaginal sex and over 20% (equivalent to 1 transmission per 5 exposures) for receptive anal sex.

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oBBdW TIL individuals with mental illness are no more likely to become violent than the average person. In fact, individuals with a mental illness are 10 times more likely to become victims of violence.
e9Yn TIL that the residents of Sarajevo remembered those lost in the Bosnian War by filling in with red resin the scars in the concrete caused by mortar/rocket shells. These haunting memorials are called Sarajevo Roses.
xOKo TIL the inspiration for the webcam came from a Computer Lab of the University of Cambridge. The cam was created to help people working in other parts of the building avoid pointless trips to the coffee pot by providing a live 128×128 greyscale picture of the state of the coffee pot.
XY88 TIL Two comprehensive studies have shown even the must astute violin players choose the sound from even brand new violins over Stradivarius violins, despite the widely held belief Stradivarius violins are vastly superior, costing several millions of dollars and being hundreds of years old.
BrRND TIL That Octopus And Squid Possess The Super-Power To Rewrite Their RNA. Researchers say that this type of RNA editing can allow a single octopus gene to produce an array of various proteins from the same DNA.