113,335+ results
113,335+ results for:
- Paleontology
Tyrannosaurs lived in the Southern Hemisphere, too
Australian fossils suggest the kin of T. rex dispersed globally 110 million years ago.
- Chemistry
Building a cheaper catalyst
Using perovskite instead of platinum in catalytic converters could shave many hundreds of dollars off the cost of a diesel car.
- Chemistry
The skinny on indoor ozone
Indoor concentrations of ozone tend to be far lower than those outside, largely because much gets destroyed as molecules of the respiratory irritant collide with surfaces and undergo transformative chemical reactions. New research identifies a hitherto ignored surface that apparently plays a major role in quashing indoor ozone: It’s human skin. And while removing ozone from indoor air should be good, what takes its place may not be, data indicate.
- Humans
Ancient DNA suggests new hominid line
Genetic data unveil a previously unknown Stone Age ancestor in central Asia.
- Earth
Bacteria show new route to making oxygen
New discovery adds to the few known biological pathways for making and metabolically using the gas.
- Chemistry
BPA found beached and at sea
Food chemists have been showing for years that bisphenol A, an estrogen-mimicking building block of polycarbonate plastics and food-can coatings, can leach into food and drinks. But other materials contain BPA – and leach it – such as certain resins used in nautical paint. And Katsuhiko Saido suspects those paints explain the high concentrations of BPA that he’s just found in beach sand and coastal seawater around the world.
- Chemistry
Better sleuthing through chemistry
New fingerprinting method can pinpoint where, when or how a chemical warfare agent came to be.
- Physics
You really can freeze hot water faster than cold*
Experiments suggest that impurities in the warmer water may explain the “Mpemba effect” in which warm water freezes faster than cold water.
- Health & Medicine
UV radiation, not vitamin D, might limit multiple sclerosis symptoms
The rarity of MS in the tropics may be due to higher ultraviolet light exposure, not necessarily increased vitamin production, new research suggests.
- Ecosystems
Athlete’s foot therapy tapped to treat bat-killing fungus
Over the past four years, a mysterious white-nose fungus has struck hibernating North American bats. Populations in affected caves and mines can experience death rates of more than 80 percent over a winter. In desperation, an informal interagency task force of scientists from state and federal agencies has just launched an experimental program to fight the plague. Their weapon: a drug ordinarily used to treat athlete’s foot.
- Life
Hawaiian caterpillars are first known amphibious insects
Developing underwater or above, it’s all good for moths that evolved new lifestyle in the islands
- Anthropology
Ancient footprints yield oldest signs of upright gait
Human ancestors may have been walking with an efficient, extended-leg technique by 3.6 million years ago.
