The famous paintings on the walls of caves in Europe mark the beginning of figurative art and a great leap forward for human culture.
But now a novel method of determining the age of some of those cave paintings questions their provenance. Not that they're fakes — only that it might not have been modern humans who made them.
The first European cave paintings are thought to have been made over 30,000 years ago. Most depict animals and hunters. Some of the eeriest are stencils of human hands, apparently made by blowing a spray of pigment over a hand held up to a wall.
KUNC's Nathan Heffel interviews Bernie Post, technical representative with Phos-Check of Ontario, California.
As of 6pm Wednesday, air tankers flying out of the JeffCo tanker base had dropped 58,557 gallons of retardant on the High Park Fire. So what is the red stuff falling out of the planes? How does it work?
Scientists said it was an "unexpected" discovery: There's a liquid methane filled lake near the equator of Saturn's moon Titan.
Scientists had seen lakes on Titan before, but they didn't expect them near the equator because they believed the intensity of the sun at those latitudes would evaporate the liquid.
"This discovery was completely unexpected because lakes are not stable at tropical latitudes," planetary scientist Caitlin Griffith of the University of Arizona, who led the discovery team, told the AP.
A NASA mission aimed at surveying black holes and supernovae, among other things, launched successfully today at noon ET from beneath the belly of a wide-body jet flying approximately 40,000 feet above a darkened Pacific Ocean.
The 772-pound NuSTAR X-ray observatory was carried into an equatorial orbit about 400 miles above the Earth by a Pegasus rocket, which fired its three-stage motor for 13 minutes after being dropped by the L-1011 jet.
New analysis (pdf) of climate data finds that since 1912, the United States has warmed 1.3 degrees. But that warming is concentrated in certain states, some of which have "warmed 60 times faster than the 10 slowest-warming states."
All of that is according to Climate Central, a research and journalism non-profit that seeks to inform the public about climate and energy. The center looked at data from the National Climatic Data Center's U.S. Historical Climatology Network.