Body sensor collects vital data by making you sweat

This is not only less invasive than a blood sample, it’s potentially much more practical. You can’t always take blood (a pilot isn’t about to try it mid-flight), and it’s not realistic to monitor blood continuously. With sweat, that’s not a problem — the scientists could track electrolytes for up to five hours at a time. That could be vital for tracking conditions where you need continuous data,