If you want to blame something for an overcast day, it's safe to go with the tropics. Water vapor originating from the Earth's tropics is transported to mid-latitudes on long filaments of flowing air that intermittently travel across the world's oceans.

When these airy tendrils make landfall, they can cause severe floods and other extreme weather events. Yet despite the importance of these "atmospheric rivers" for the global water and heat cycles, the mechanism behind their formation is still a mystery.

A lot of problems, associated with the mixing of the liquid in the microchannels, could be solved via proper organization of the inhomogeneous slip on the walls of these channels, according to a joint group of Russian and German scientists lead by Olga Vinogradova, professor at the M.V. Lomonosov Moscow State University. 

Scientists are beginning to unwrap the biology behind why some people are more prone to major depression and other psychiatric disorders than others when experiencing stressful life events.

The researchers found that cellular activity in response to stress hormone receptor activation differs from individual to individual.

The study, led by Janine Arloth, Ryan Bogdan, and Elisabeth Binder at the Max Planck Institute of Psychiatry in Germany, also shows that the genetic variations underlying this difference in stress response correlate with dysfunction in the amygdala, a brain region that is an important part of the stress hormone response.

 Researchers have used satellite data to detect deposits of glass within impact craters on Mars. Though formed in the searing heat of a violent impact, the glasses just might provide a delicate window into the possibility of past life on the Red Planet.

Over the last few years, several research groups have shown that, here on Earth, ancient biosignatures can be preserved in impact glass. One of those studies, led by Brown geologist Peter Schultz and published last year, found organic molecules and even plant matter entombed in glass formed by an impact that occurred millions of years ago in Argentina. Schultz suggested that similar processes might preserve signs of life on Mars, if indeed they were present at the time of an impact.

NASA has released data showing how temperature and rainfall patterns worldwide may change through the year 2100 because of growing concentrations of greenhouse gases in Earth's atmosphere.

The dataset shows projected changes worldwide on a regional level in response to different scenarios of increasing carbon dioxide simulated by 21 climate models. The high-resolution data, which can be viewed on a daily timescale at the scale of individual cities and towns, will help scientists and planners conduct climate risk assessments to better understand local and global effects of hazards, such as severe drought, floods, heat waves and losses in agriculture productivity. 

Welcome to a new way to manipulate matter. 

Mixing computers and water typically is usually a bad idea but bioengineers at Stanford have built a synchronous computer that operates using the physics of moving water droplets. They used droplet fluid dynamics to demonstrate a synchronous, universal droplet logic and control.

Because of its universal nature, the droplet computer can perform any operation that a conventional electronic computer can crunch, although still at significantly slower rates in this early stage. 

The crucial clock