This beautiful and eerie photograph is evidence of what astronomers believe could be remnants of a head-on collision of 2 asteroids, resulting in an X-shaped debris pattern ahead of a long stream of dust that's usually indicative of a comet.
In 2005, Stanford scientist Karl Deisseroth discovered how to switch individual brain cells on and off by using light in a technique he dubbed 'optogenetics'.
Research teams around the world have since used this technique to study brain cells, heart cells, stem cells and others regulated by electrical signals.
However, light-sensitive proteins were efficient at switching cells on but proved less effective at turning them off.
Now, after almost a decade of research, scientists have been able to shut down the neurons as well as activate them.