jellyfish make a pocket of high-pressure water under their bell

As they swim, , which serves as a kind of wall to push off to help them swim faster...

As they swim, jellyfish make a pocket of high-pressure water under their bell, which serves as a kind of wall to push off to help them swim faster https://t.co/gawDZbFBXb pic.twitter.com/aL6x03fCpc

— New Scientist (@newscientist) January 7, 2021