The Download: the Pentagon’s AI-powered lie detector and young organ limits

The Pentagon has requested $30.3 million over five years to develop “Polygraph+,” an AI-powered lie detector that will use machine-learning scoring algorithms and standoff sensing to read physiological signals without a device, aiming to improve polygraph accuracy. Meanwhile, new research on transplanted hearts challenges the idea that continuous organ replacement can grant longevity, revealing limits to rejuvenation despite earlier claims of “living younger and younger.”