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254,479 articles from PhysOrg

Astronomers detect a second planet orbiting two stars

Planets orbiting binary stars are in a tough situation: They have to contend with the gravitational pull of two separate stars. Planetary formation around a single star like our sun is relatively straightforward compared to what circumbinary planets go through. Until recently, astronomers weren't sure they existed.

Anti-Black bias can persist despite kids' tendency to favor same-gender peers

Children as young as five can display more positive associations with white children over Black children on measures of unconscious bias, and new research from York University finds this can be true even when taking into consideration kids' tendencies to favor same-gender peers. Taking an own-gender lens does, however, increase positive associations toward Black children, pointing to both the...

Browsing herbivores increase savanna resilience to droughts, study finds

Extreme climate events pose an ever-increasing threat to savannas around the world. However, the ability of these mixed woodland-grassland ecosystems to resist periods of drought can be improved with a higher number of browsing herbivores—i.e., animals such as kudus, springboks, and common elands that feed on woody vegetation. These help increase the amount of plant diversity and thus the...

Tracing the evolution of wheat spikes since the Neolithic revolution

About 12,000 years ago, the Neolithic revolution radically changed the economy, diet and structure of the first human societies in the Fertile Crescent of the Near East. With the beginning of the cultivation of cereals, such as wheat and barley, and the domestication of animals, the first cities emerged in a new social context marked by a productive economy.

Biologists discover the first fossil species of mountain ants in Baltic amber

St Petersburg University scientists found an ant of the genus Manica in a piece of amber in collection of the Kaliningrad Amber Museum. Such ants had previously been found only in the mountains of Europe, the Caucasus, North America, and Japan. The scientists report that the age of the finding is about 33.9–37.8 million years. This is the most ancient and first known fossil species of this...