While they don’t have bills to pay or worldwide pandemics to worry about, even rats and monkeys experience stress.
The National Science Foundation, National Aeronautics and Space Administrationb and the Office of Naval Research spent more than $500,000 — more than $2.5 million in inflation adjusted 2021 dollars — over a decade to determine under what conditions rats, monkeys, and humans bite and clench their jaws.
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