Scientists are hoping to revive a 50-year-old failed experiment that tried to discover how biological life could have originated from non-living chemical processes.

Certain intestinal bacteria can spur an imbalance in immune system cells, leading to an inflammation of the digestive tract, according to a new study out of New York University.

Duck-billed dinosaurs have puzzled paleontologists for years, particularly because certain chambers in some of their skulls did not seem to have a clear purpose. But CT-scanning, originally designed for medical use, seems to support scientific speculation that the chambers played some role in communication between the animals.

Many have experienced the calming effects that a simple stroll in a park can produce, but scientists are discovering that walking in green surroundings can also reduce the symptoms experienced by children diagnosed with attention deficit hyperactivity disorder (ADHD).

In a recent issue of the journal BioScience, ecologist Jeffrey Levinton of Stony Brook University, New York, offered a well-written review of the current status of the “Cambrian Explosion” hypothesis and presented at least two enigmas in evolutionary thinking.¹