Timelapse of sweat sticker (IMAGE) Northwestern University Caption Timelapse footage (sped up by 30x) of sweat entering and changing color inside the sticker's microfluidic channels Credit Northwestern University/University of Hawai?i at Mānoa Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.