Permanent magnets can come in lots of different shapes and sizes. Bar magnets and horseshoe magnets are two of the most common shapes of magnet. The magnetic field is shown by lines with arrows ...

“We found that certain ratios of the cut’s width and length, the cut’s size ... Chi’s shape-shifting surface is very fast; it reacts to changes in the magnetic field in under 2 ...

Shape-shifting liquid metal robots might not be limited to science fiction anymore. Miniature machines can switch from solid to liquid and back again to squeeze into tight spaces and perform tasks ...