In the Feb. 18 SN: Anniversary of a celebrity supernova, readying for the next stellar explosion, human-animal chimeras, hottest year on record, molecules tied in knots, cancer results don’t reproduce and more.
LIGHTING UP When stimulated with light, DNA “blinks” on, making cellular structures (chromosome shown) visible without the need for fluorescent dyes.
B. Dong et al/PNAS 2016
HELIUM COMPOUND Scientists created a chemical compound of helium and sodium by squeezing the elements to extremely high pressures. Helium atoms (green cubes) are arranged in a 3-D checkerboard structure, each surrounded by eight sodium atoms (purple). Electron pairs (red) sit in the spaces between helium atoms.
Courtesy of A.R. Oganov
WAVE GOODBYE Firing a pair of sound waves at a tsunami, like this one that hit Japan in 2011, could weaken the wall of water and decrease its height, a researcher proposes.