Apple is working with Stanford Medicine researchers on a research study to determine whether the Apple Watch’s heart-rate sensor can identify irregular heart rhythms associated with a condition known as atrial fibrillation (AFib).

A blue glowing device the size of a peppercorn can activate neurons of the brain, spinal cord or limbs in mice and is powered wirelessly using the mouse's own body to transfer energy. Developed by a Stanford Bio-X team, the device is the first to deliver optogenetic nerve stimulation in a fully implantable format.