estrogen sensor 1 (IMAGE) California Institute of Technology Caption A wireless sweat sensor developed in the lab of Caltech's Wei Gao monitors levels of estradiol, an important female hormone that plays a role in health and fertility. Credit Caltech Usage Restrictions Must credit Caltech License Original 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.