We all learned about DNA with graphic illustrations of a colorful double helix. Now we have an actual photograph, from an electron microscope, of a DNA strand. Enzo di Fabrizio and a team at the University of Genoa in Italy developed a technique to isolate and dehydrate a single strand of DNA, seen here stretched between two microscopic silicon pillars. Read about how they did it, and see a zoomed-in image at the Atlantic. Link

(Image credit: Enzo di Fabrizio)