HEY LOOK The spherical bacteria Synechocystis (shown here in false color) can use their single-celled bodies almost like eyeballs. A light shining up from the bottom of this image passes through the cells and focuses on the far side (white arrows highlight examples of focused light). A laser light source in the center (red dot) helped test which way the cells move in reaction to bright spots of light.
N. Schuergers et al/eLife 2016
A brown bear has to bulk up during summer to survive winter hibernation. Its gut flora may help them get fat in a healthy way.
AGE STAGE By about 2 years old, mice that age normally (back left) are hunchbacked and nearly blind. A treatment that removes decrepit “senescent” cells makes mice the same age (front right) healthier: They look and act younger and live longer.