Funny, LB was also thinking of those Mac OS Myths these days. As to be expected, there comes a bolder analysis than Lucy's:
Myth: macOS is based on Linux or BSD
https://www.youtube.com/watch?foo=bar&v=GMPXhUbmjYE
Myth: macOS is based on Linux or BSD
https://www.youtube.com/watch?foo=bar&v=GMPXhUbmjYE