Only three presidents had never had any pets while in office. who are they?

United States presidents have often kept pets while in office, or pets have been part of their families. Only James K. Polk, Andrew Johnson, and Donald Trump did not have presidential pets while in office.

James K. Polk

Andrew Johnson

Donald Trump

Explanation:

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Ben Barres was a neurobiologist who made groundbreaking discoveries regarding the structure and function of the brain that may have implications for understanding Alzheimer’s disease and other degenerative disorders.

As a transgender man he became an outspoken opponent of gender bias in science.

The 63-year-old, a professor of neurobiology at Stanford University, was one of the world’s leading researchers on glial cells; the most numerous structures in the brain, whose purpose was long a complete mystery.