If a razor is a simple machine defined by its microscopic perfection, why not look at it under a microscope ... 100 microns—for reference, a human facial hair is somewhere between 50 and ...

This leading-edge research, described in the journal Science, used a scanning electron microscope to peer at a razor as it sliced through strands of hair. It found that, under the right conditions ...

A hair analysis uses special techniques to look closely at your hair under a microscope. The results can show details about your health and habits. Different labs do the tests differently ...

From reproductive rights to climate change to Big Tech, The Independent is on the ground when the story is developing. Whether it's investigating the financials of Elon Musk's pro-Trump PAC or ...