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Dispersal of mercury into the air has risen substantially since the industrial revolution, leading to increased mercury deposits in water and soil. Once there, it gets transformed by bacteria into methylmercury, a highly toxic form of the naturally-occurring heavy metal that can affect neurological and immune systems. Stored in the tissues of wildlife and humans, methylmercury concentrations are magnified with each step up the food chain. The mercury levels of a large predator fish such as trout, for example, may be more than one million times that of ambient water, potentially causing serious health consequences for human and wildlife consumers.

When it comes to behaviour, researchers have moved beyond the “nature versus nurture” debate. It’s understood that genes and environment both play a role. However, how they interact at a molecular level to shape behaviour is still unclear.

A new study led by scientists at the University of Toronto sheds valuable light on this relationship. The paper, published in  Proceedings of the National Academy of Sciences of the United States of America, reveals how epigenetics – changes in gene expression that do not change DNA – interact with genes to shape different feeding behaviours in fruit flies. This research unlocks the molecular mechanism that leads “rover” flies to forage for food more than “sitter” flies.

Pollution is linked to an estimated nine million deaths each year worldwide – equivalent to one in six (16%) of all deaths, according to a major new report in The Lancet. Most of these deaths are due to non-communicable diseases caused by pollution such as heart disease, stroke, lung cancer and chronic obstructive pulmonary disease (COPD).

It’s perhaps one of the most common emotions to feel in a relationship, but one that’s virtually untouched when it comes to studying relationships in monogamous primate species. What scientists have recently discovered about jealousy in pair-bonded titi monkeys at the California National Primate Research Center (CNPRC) offers insight into human emotions and their consequences.

Thirty years after NASA and NOAA launched a groundbreaking airborne campaign to study the Antarctic ozone hole, the two federal science agencies have once again joined forces over the world’s highest, driest and coldest continent to sniff out the secrets of the atmosphere.

On Oct. 14, NASA’s heavily instrumented DC-8 flew over Antarctica as part of the Atmospheric Tomography Mission or ATom, an unprecedented effort to sample the remote atmosphere to understand the distribution of man-made pollutants and short-lived greenhouse gases.