Humans
We summarize the week's scientific breakthroughs every Thursday.
- Life
Boys and girls differ in genetic response to what mom eats
Expectant mothers’ diets may influence gene activity differently in the placentas that feed sons and daughters, a new mouse study reveals.
- Health & Medicine
Gene linked to pain perception
A common genetic variant that appears to increase sensitivity could lead to the development of better medications.
- Earth
Green-ish pesticides bee-devil honey makers
Pesticides are agents designed to rid targeted portions of the human environment of undesirable critters – such as boll weevils, roaches or carpenter ants. They’re not supposed to harm beneficials. Like bees. Yet a new study from China finds that two widely used pyrethroid pesticides – chemicals that are rather “green” as bug killers go – can significantly impair the pollinators’ reproduction.
- Life
Mature females key to beluga sturgeon survival
Hatchery fish are unlikely to restore caviar-producing fish populations, a new assessment finds.
- Earth
Fowl surprise! Methylmercury improves hatching rate
A pinch of methylmercury is just ducky for mallard reproduction, according to a new federal study. The findings are counterintuitive, since methylmercury is ordinarily a potent neurotoxic pollutant.
- Psychology
Alcohol distills aggression in large men
A new study suggests that the ‘big, mean drunk guy’ stereotype contains some truth.
- Life
Researchers distinguish two different types of blood stem cells
Working in mice, scientists find that red and white blood cells arise from different progenitors.
- Health & Medicine
Old drug may be first choice for childhood petit mal epilepsy
Three-way trial shows ethosuximide edging out two newer choices.
- Chemistry
Plasticizers kept from leaching out
‘Chemicals of concern’ may be made safer in new materials.
- Agriculture
Frogs: Clues to how weed killer may feminize males
Atrazine, a widely used agricultural herbicide, not only can alter hormone levels in the developing frogs, but also perturb their physical development — and lead to an excess number of females, researchers report. Their new findings may help explain observations reported by a number of other research groups that at least in frogs, fairly low concentrations of atrazine can induce a feminization — or demasculinization.
- Health & Medicine
Coffee not linked to heart arrhythmia
A large survey of insured people finds no extra hospitalizations in java swillers.
- Archaeology
Stone Age engraving traditions appear on ostrich eggshells
Fragments indicate symbolic communication on 60,000-year-old water containers.
