Face mask sensor can detect leaks and your heart rate

You might not be thrilled that face masks are a part of daily life during the COVID-19 pandemic, but they could soon be useful for more than protecting others and yourself. Researchers at Northwestern University (including battery-free Game Boy creator Josiah Hester) have developed a "FaceBit" face mask sensor that can track a wide range of health data from inside an N95 mask. The magnetically-attached unit can gauge your heart rate using the subtle head movements from blood pumping, and can det...