Health workers wear personal protective equipment at a Covid-19 testing site outside Parkview Community Hospital Medical Center in Riverside, California.
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People who love a good thrill are known in psychology as high sensation seekers. According to psychologist Ken Carter, high sensation seekers produce less cortisol than low sensation seekers in risky situations like white water kayaking. They also seem to produce more dopamine, which is that neurotransmitter that's associated with pleasure.
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A healthcare worker prepares a dose of the Pfizer-BioNTech Covid-19 vaccine during a vaccination event at a school in Boston, Massachusetts, U.S., on Monday, August 16, 2021.
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