Gravity, streaming on HBO Max, portrays the space phenomenon of Kessler Syndrome. But is it realistic? We check in with a space expert to answer your questions.

Phil tries to max-out a boat that propels itself using just water and gravity. We pour over water specifically and fluids in general. Heavy air, fluid sand, Archimedes and the metric system; this ...

But when you but the same ones together, they repel. Could we find magnets powerful enough to repel each other and float Phil off the ground? Plus, watch magnets defy gravity all on their own.