How the polar vortex produced rapid evolution in lizards
A surgical technique designed to preserve proprioceptive signals after amputation should allow patients to sense the location of their prostheses, feedback that is often compromised by convential surgery.
To simply say that the White Cliffs of Dover are made of chalk would miss the point of Life at the Edge of Sight: A Photographic Exploration of the Microbial World. The chalk giving the famous cliffs their white appearance was formed from the exoskeletons of plated marine microbes called coccolithophores.
One of the most detailed astronomical images ever produced, this panoramic view of the Orion Nebula—just 1,500 light years from our own solar system and on the same spiral arm of the Milky Way galaxy—is a composite made from many exposures over several months. Stars are born in nebulas like this one, as clouds of hydrogen gas coalesce into progressively denser and hotter clusters that eventually ignite in a fusion reaction. More than 3,000 stars appear in this image, including hundreds of young ones, allowing the systematic study of the various stages in this extraordinary process. The Hubble’s views of the nebula also enabled astronomers to see protoplanetary disks, the stuff from which planets are thought to form and, for the first time, “brown dwarfs,” failed stars that were not dense or hot enough to sustain fusion.