The Milky Way is like NGC 4594 (pictured), a disc shaped spiral galaxy with around 200 billion stars. Above and below the galactic plane there is a halo, which includes older stars dating back to the galaxy’s childhood billions of years ago. In principle they should all be primitive and poor in heavy elements like gold, platinum and uranium. New research shows that the explanation lies in violent jets from exploding giant stars. (Credit: Image courtesy of University of Copenhagen)
Reconstruction of a small section from the previous image, showing the relative thickness of each blood vessel in the network (color-coded by thickness). The area depicted in the image is about 0.275 millimeters across. (Credit: Biomedical Optics Express.)
ScienceDaily (Nov. 14, 2011) — Just as in humans, there are also the tough types or those with a more delicate personality among mice, as Eneritz Gómez, a psychologist at the University of the Basque Country (UPV/EHU), has been able to confirm. Some adopt an active strategy when faced with stress situations and somehow try to tackle the problem, whereas others display a passive attitude. Those in the second group are more vulnerable: some of the physiological characteristics resemble those attributed to human depression.