meaning that the data shared between your browser and the website is encrypted and cannot be read by others. SSL certificates are always used by legit and safe websites. Unfortunately scammers increasingly also use SSL certificates so it is no guarantee that you are visiting a reliable website...
Pulse oximeters helped save the lives of two emergency physicians I know, alerting them early on to the need for treatment. When they noticed their oxygen levels declining, both went to the hospital and recovered(though one waited longer and required more treatment). Detection of hypoxia, early...