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Results of 25-year experiment about "keystone species" in Chihuahuan Desert, Arizona, identifies the kangaroo rat as an unexected key player in the ecosystem. Scientists identify how raindrops form so fast in nature – the secret is turbulance. A new "surgeon's knife" that uses a microjet of liquid. WHO's World Health Day this year focuses on mental health, which it estimates, is responsible for 15% of the global burden of illness. Neurological lessons from lobsters' digestive systems.