Researchers have developed a revolutionary pacemaker the size of a grain of rice, designed to transform post-surgical cardiac care, particularly for children. This biodegradable device eliminates complications associated with traditional pacemakers, which often require hazardous leads and external power sources. It uses body fluids for power and features a light-activated circuit, allowing it to deliver precise electrical impulses without invasive wires. Currently in preclinical testing, the team aims to seek approval for human trials in the coming years, highlighting its potential for safe, effective heart rhythm management.