With the discovery of sulfa drugs and antibiotics came man’s confidence in his ability to control infectious diseases. But now, that confidence is being shaken by once defenseless germs that have learned to outwit man and thrive in the face of his wonder drugs.… One way to cut down on drug resistance transfer is to […]
Mutations that prevent cells from spell-checking their DNA may make cancer cells vulnerable to immunotherapies, a new study suggests. A type of immune therapy known as PD-1 blockade controlled cancer in 77 percent of patients with defects in DNA mismatch repair — the system cells use to spell-check and fix errors in DNA (SN Online: […]
When things get hot, embryonic bearded dragon lizards turn female — and now scientists might know why. New analyses, reported online June 14 in Science Advances, reveal that temperature-induced changes in RNA’s protein-making instructions might set off this sex switch. The findings might also apply to other reptile species whose sex is influenced by temperature. […]
Earth’s dry regions have more trees than once thought — a hopeful note in the fight against climate change. An analysis of high-resolution satellite imagery reveals that drylands globally have 40 to 47 percent more tree cover (an extra 467 million hectares) than reported in earlier estimates. An international team of researchers used Google Earth […]
John Archibald Wheeler was fond of clever phrases. He made the term “black hole” famous in the 1960s. He also coined the now-familiar “wormhole” and “quantum foam.” While further pondering the mystery of quantum physics at the University of Texas at Austin during the 1980s, Wheeler repeatedly uttered his favorite interrogative slogan: “How come the […]
The Juno spacecraft’s first closeup views of Jupiter’s Great Red Spot are here. The spacecraft flew just 9,000 kilometers above the famous storm on July 10. Scientists had expected the images to take until at least the night of July 13 to download because the spacecraft’s antenna was pointed away from Earth. But the first […]
Ravens have passed what may be their toughest tests yet of powers that, at least on a good day, let people and other apes plan ahead. Lab-dwelling common ravens (Corvus corax) in Sweden at least matched the performance of nonhuman apes and young children in peculiar tests of advanced planning ability. The birds faced such […]
Walls can’t talk, but scientists can now read stories written in their subatomic particles. And that could make it harder to store radioactive material in secret. Nuclear radiation rearranges the electrons in insulators such as brick, glass and porcelain. So comparing the positions of electrons in atoms at different spots on walls, windows and floors […]
A peek at tardigrades’ genetic diaries may dispel a rumor about an amazing feat the tiny creatures were supposed to perform: borrowing large numbers of genes from other organisms. Tardigrades — also known as water bears and moss piglets — hardly ever borrow DNA from other creatures, researchers report July 27 in PLOS Biology. New […]
Venus may have been all wet early on. New simulations suggest that if the now-hellish planet had just the right amount of cloud cover, carbon dioxide and water to start with, Venus could have formed an ocean. The result, published online July 18 in the Journal of Geophysical Research: Planets, provides a new clue to […]