How microbes can exacerbate cognitive decline

Recent research has found that changes in the gut microbiota — the trillions of bacteria and other microbes that live in the intestines — can alter the brain and behavior. A new study could elucidate how and why that phenomenon occurs.

Cities are making mammals bigger

While climate change is causing some animals to shrink, a new study shows urbanization is causing many mammal species to grow both bigger and longer, possibly because of readily available food in places packed with people.