The give and take of mega-flares from stars

The long relationships between stars and the planets around them – including the Sun and the Earth – may be even more complex than previously thought. This is one conclusion of a new study involving thousands of stars using NASA’s Chandra X-ray Observa…

Several persistent chemicals found in fetal organs

Researchers found industrial chemicals in the organs of fetuses conceived decades after many countries had banned the substances. The researchers urge decision makers to consider the combined impact of the mix of chemicals that accumulate in people and…

Most rivers run dry — now and then

A new study found that between 51-60% of the 64 million kilometres of rivers and streams on Earth that they investigated stop flowing periodically, or run dry for part of the year. It is the first-ever empirically grounded effort to quantify the global…