Health Pigs can breathe oxygen via their rectum, so humans probably can too Piping an oxygen-rich liquid into a pig's rectum can boost their blood oxygen, a step towards doing the same thing in people as a treatment to restore lung function NewsFree
Earth Complex life may have had a false start 2.3 billion years ago High levels of oceanic oxygen could have allowed advanced, animal-like life to develop for the first time – only to be wiped out again as oxygen vanished NewsFree