Five-year-olds can reason about the world from multiple perspectives simultaneously, according to a new theory by researchers in Japan and Australia. Using an established branch of mathematics called Category Theory, the researchers explain why specific reasoning skills develop in children at certain ages, particularly at age five

Neurosurgeons from NewYork-Presbyterian Hospital/Weill Cornell Medical Center performed the world’s first intra-arterial cerebral infusion of Avastin (bevacizumab) directly into a patient’s malignant brain tumor.

Neurosurgeons from NewYork-Presbyterian Hospital/Weill Cornell Medical Center performed the world’s first intra-arterial cerebral infusion of Avastin (bevacizumab) directly into a patient’s malignant brain tumor.

As delegates at the World Summit on Food Security discuss urgent measures to counter the forward march of hunger, we must mobilise all world citizens – not just global leaders -to feed the more than one billion hungry people around the world.

New methods of studying avian influenza strains and visually mapping their movement around the world will help scientists more quickly learn the behavior of the pandemic H1N1 flu virus, Ohio State University researchers say.