The claim is plausible: * https://space.stackexchange.com/questions/36411/healing-of-bruises-and-internal-bleeding-in-0g https://space.stackexchange.com/questi

The claim is plausible: * https://space.stackexchange.com/questions/36411/healing-of-bruises-and-internal-bleeding-in-0g https://space.stackexchange.com/questions/36411/healing-of-b... Thankfully no one to date has been injured for a 'full test' to have been done. Blood flowing backwards has been observed: * https://www.newscientist.com/article/2223705-low-gravity-in-space-made-some-astronauts-blood-flow-backwards/ https://www.newscientist.com/article/2223705-low-gravity-in-...