Christian Sidor of the University of Washington digs for tetrapod fossils in Allan Hills, part of the southern Victoria Land area of Antarctica, during field work in January 2006. For the first time paleontologists have found fossilized burrows of tetrapods – any land vertebrates with four legs or leglike appendages – in Antarctica dating from the Early Triassic epoch, about 245 million years ago.

One of the great scientific challenges is to understand the design principles and origins of the human brain. New research has shed light on the evolutionary origins of the brain and how it evolved into the remarkably complex structure found in humans.

Researchers at the University of Iowa and the Veterans Affairs Iowa City Health Care System have uncovered a brain pathway that shuts down seizures.