String! I definitely wasn’t expecting to see this - it startled me when I first
came across it, partly because it was looping up dramatically into midair before
it sagged, as I watched, under the glare of the microscope’s electron beam. It
came to rest draped over one
![(Untitled)](/content/images/size/w795/cadd0ee7e523eb3d0ece25d39dee8f46/tumblr_mt4kl6t5ol1spzrmao1_1280.jpg)