On board the International Space Station during the historic Axiom-4 mission, ISRO astronaut Shubhanshu Shukla uses a needle to set a floating water blob spinning. With no gravity to pull it down, the water responds to rotation the only way it can, it stretches outward along its axis and takes a perfect cylindrical shape, sculpted purely by centripetal force and surface tension. Then, with another precise touch of the needle, he kills the spin, and the cylinder collapses back into a sphere. Back