In the Dec. 10 SN: Star-starved galaxies, animal math, Parkinson’s roots in the gut, supersolid success, Celebrex’s controversial heart risk, a prionlike memory protein, yo-yo dieting’s downside, blue begonias and more.
SUPER JUMPER A little robot named Salto is an agile jumper that relies on a twisted latex spring to gain extra height. One day, robots like it could bound across rubble in search-and-rescue operations.
Stephen McNally and Roxanne Makasdjian/UC Berkeley
NUMBER SMARTS Cats show quantity-related abilities. Without training, cats can pick out differences between groups of a few small objects, such as 2 versus 5, but the felines may be using visual shortcuts.
ENERGIZED A new energy-storing fabric captures energy from the sun and from the wearer's motion simultaneously. The fabric could be used to power wearable electronic devices through exercise or small everyday movements.