Neglect, stress and abuse are all more common among the poor. New studies show that these factors can cause long-term changes in learning, brains and behavior, and suggest how to prevent damage in the vulnerable years. Could treating depressed mothers promote healthy interactions with their kids?

Climate scientists worry about feedbacks, glacial melting, sea level rise, using tax policy to slow warming, and the complexity of climate science. Is it realistic to base our economy on endless growth? What does human behavior tell us about dealing with warming?

Do new species arise because so many niches are available in a new habitat? Or do they arise because newcomers have multiple talents for survival? A new study points to traits that enable success in the new location.

The long rise may be inflated by redefinition of autism, social acceptance of the disabled and desire for services. If this is a real epidemic, it’s even more critical to find the cause.

Cleaner fish remove parasites from other fish. Why do males punish females who eat the wrong food from their host? A clue to the evolution of cooperation?

It’s one of the biggest puzzles of paleontology: Why did North America’s large mammals go extinct shortly after the glaciers melted about 15k years ago? New study suggests that hunters get the credit — or blame.

MRI scans of older people show major differences between searchers and non-searchers. After seven hours of Internet experience, those differences disappear. Honest? Could changing the brain be this easy?

Underground nuclear tests have been the biggest roadblock to a comprehensive test ban. How are these explosions detected, and how reliably?

The epidemic fades, with 61 confirmed deaths and 5,251 cases so far. Were the public health warnings overdone? Or did they help stem the pandemic? Your guide to the time of finger-pointing, flu-style.

The feds put out a massive report on American birds, and the #1 source of data is – amateurs! What is the role of amateurs in ornithology? Hint: if you want to survey 800 species on 3.5 million square miles…