Christopher JoyceChristopher Joyce is a correspondent on the science desk at NPR. His stories can be heard on all of NPR's news programs, including NPR's Morning Edition, All Things Considered, and Weekend Edition.
(Left) A close-up view of a spirally fractured mastodon femur. (Right) A boulder discovered at the Cerutti Mastodon site in San Diego County thought to have been used by early humans as a hammerstone.
Tom Démeré/San Diego Natural History Museum
Native westslope cutthroat trout swim in the north fork of the Flathead River in northwestern Montana. However, cutthroat trout populations are threatened by hybridization from mating with rainbow trout.
NET Power has built carbon capture technology into its power plant outside Houston, which will generate electricity by burning natural gas. The demonstration project should be fully operational later this year, according to NET Power.
Courtesy of NET Power
A white-throated round-eared bat (Tonatia silvicola) catches — and munches — a katydid on Barro Colorado Island in Panama. Katydids are "the potato chips of the rain forest," scientists say.
Christian Ziegler/ Minden Pictures/Getty Images
A U.S. Coast Guard crew retrieves a canister dropped by parachute in the Arctic in 2011. Over the past four decades, researchers at the University of California, Santa Barbara, and several other universities have studied shifts in atmospheric circulation above the Arctic.
More than 10 wildfires burned over 200,000 acres in Southern California in October 2003, many of them started by humans. This satellite image shows strong winds carrying smoke over the Pacific.
MODIS Rapid Response Team/NASA
Tiny, shrimplike amphipods living in the Mariana Trench were contaminated at levels similar to those found in crabs living in waters fed by one of China's most polluted rivers.
Dr. Alan Jamieson/Newcastle University