In another embodiment, an additional sensor can measure another piece of {HEAD ~ information} regarding {TAIL ~ the person} using the hydration sensor, such as the persons body temperature or activity level 
In another embodiment , an additional sensor can measure another piece of { HEAD ~ information } regarding { TAIL ~ the person } using the hydration sensor , such as the persons body temperature or activity level
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH