It's more than just fun. Cold electron microscopy can be used to create movies of tiny, fast-moving objects .Typically electron microscopes use beams of hot electrons. Just like electrons have a much smaller wavelength than photons, they can image the micro and nano world. The bad side is that hot electrons travel in a bunch of different directions, so not many make it to the microscope's detector.As a result, electron microscopes can take days to make an object, making it really hard to capture a moving target like a functioning protein. But cold electrons don't disolve as quickl which can allow researchers to use them on one target producing images much brighter than those of typical electron microscopes.