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Scientists at NASA and Johns Hopkins University developed an ingestible pill to monitor the core body temperature of astronauts during space flight. Once ingested, the quartz crystal transmits a harmless, low-frequency signal through the body. This signal can then be retrieved by a recorder, outside of the body, that displays the core body temperature. (It will remain in an individual’s system for 18 to 30 hours, before passing safely.)
NFL football teams are using the CorTemp technology to monitor their players. They are also evaluating headbands (with embedded thermometers) to determine if they can provide the same type of information. If successful, this would make the technology more affordable for high school and college athletic programs.
Read More - Article on CorTemp Technology