Due to the random nature of genetics there is an infinitesimally slim but technically non-zero possibility that humans become extinct because every baby born during a 60 year period has the same sex.

Ignoring "designer" babies of course, though for most of human history that wasn't an option.

Submitted September 15, 2019 at 04:33AM by EarthMarsUranus https://ift.tt/32FcX79