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Wildlife species are being exposed to high levels of rat poison in northwest California, with illegal marijuana farms the most likely source point, according to a study led by the University of California, Davis, with the California Academy of Sciences.

A paper appearing in Geophysical Research Letters uses machine learning to craft an improved model for understanding geothermal heat flux — heat emanating from the Earth’s interior — below the Greenland Ice Sheet. It’s a research approach new to glaciology that could lead to more accurate predictions for ice-mass loss and global sea-level rise.

Light is an important cue for nearly all life on Earth. Plants use light for photosynthesis, animals use light to set sleep cycles, and marine organisms use light to find food, avoid predators and even hide in plain sight.

One of the most puzzling questions in breast cancer research is why some tumors stay put, while rogue cells from others break free and spread to surrounding tissues, the first step toward creating a more lethal disease. Although researchers have found some signs in mutated genes or telltale proteins on the cell’s surface, those discoveries don’t tell the whole story.

Chinook salmon, an iconic species in the Pacific Northwest that supports a major fishery industry and indigenous traditions, have lost up to two-thirds of their genetic diversity over the past 7,000 years, according to a new study. Scientists warn the loss could make it difficult for the species to cope with warming global temperatures and ocean acidification — environmental changes that are already impacting the fish today.