May
21st
Fri
21st
An argonaut uses its shell to trap air from the surface and dives to a depth where the encased gas perfectly counteracts its own weight, allowing it to bob effortlessly without rising or sinking. [Octopus specialists Julian] Finn and [Mark] Norman filmed and photographed live animals in the act of trapping their air bubbles, solving a mystery that has been debated for millennia …
