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Some of these rhythms are influenced by pure physiology: Walking, swimming and having a heartbeat are all rhythmic.

“Along the way, he helps audiences understand their own physiologies and how to improve their overall performance, health and well-being.”

And El-Mallakh, the director of the Mood Disorders Research Program at the University of Louisville School of Medicine, noted that determining the brain physiology behind depression wasn’t necessarily important so long as patient symptoms improve.

"For the secretary of state to ignore a letter from two Nobel laureates in physiology or medicine for three months is a little surprising, I would say," he told the inquiry.

“Species at each level of the food chain, from invertebrates to fish, birds, marine mammals and humans, can be affected differently based on their physiology and feeding strategies,” she said.