In the future, doctors may no longer need bulky ultrasound machines and probes to diagnose medical conditions. Engineers at MIT have created a sticker that provides continuous high-resolution ultrasound imaging for 48 hours. The device could be used to diagnose and monitor various diseases. The researchers are working on a wireless version of the stickers, which they say could eventually be used to track chemical reactions, measure blood flow in real-time, and monitor tumor growth.