A life of cutting apart leaves wears down the leaf-cutter ant's razor sharp mandibles, and that's when they decide to switch jobs. Read about leaf-cutter ants.
Astronomers have found a star rich in zirconium, the material used to make a substitute for diamonds. The star is called LS IV-14 116. It is 2,000 light years from Earth.
Astronomers think they've discovered why a galaxy's spiral arms wind up tightly around the galaxy's core as the system rotates. Read more on spiral galaxies.
As 2011 opens, flooding in Queensland is forcing people to leave their homes. Police are wading through chest-deep floodwaters in suburbs, telling people to leave.