Science is Fun Fridays!

That itty bitty bit there by the pencil tip is the world's smallest pacemaker. It has yet to be tested on humans, but it would be implanted with a syringe and controlled by light before dissolving when no longer needed. It would be particularly well-suited for newborns with congenital heart defects. The pacemaker is paired with a wearable device on the patient's chest. When an irregular heartbeat is detected, the device shines a light pulse to activate the unit. It is powered by a galvanic cell, which uses the body's fluids to convert chemical energy into electrical pulses that stimulate the heart. It would be meant for short-term use though, to help adults restore a normal heartbeat following cardiac surgery. "It's a paradigm shift in temporary pacing and bioelectronic medicine, opening up possibilities far beyond cardiology - including nerve regeneration, wound healing, and integrated smart implants," says researcher Bozhi Tian.