Ok you cool Cats, and Kittens here is the true story on the ring.
I told you that NCR was here for years, cranking out those cash registers. Well in the 70's they were experimenting with the first electronic, computerized registers. You actually saw the final version of these registers at a Sears store in your neighborhood. They were the big plastic White, and Green registers that had the light up keypads that guided clerks through ringing up a sale by which keys would illuminate at a specific step in the sales process.
That register had a number of unique computer chip silicone items inside that were proprietary NCR technology. One of the engineers who was on the chip design team suddenly had a heart attack one day, from the dead line stress at work. His Doctor told him, when released from the hospital that he had to learn to relax, and understand when his body was under stress. He knew that when he was under stress his body temperature would sky-rocket. One day at work he noticed a new experimental silicone chip material that was changing color as it was heating up during testing. He wondered if he could adapt it into a ring that he could wear to monitor his body temperature. ....And as they say the rest is history.