Proponents of the taxes say that if the measures pass, the money would be directed, in San Francisco, toward childhood nutrition and recreation and, in Berkeley, into the city's general fund.
Joel Saget /AFP/Getty Images
We are all Russian nesting dolls: Our intestines house many bacteria, which house many viruses. These so-called bacteriophages are likely as important for our health as the bacteria they live in.
Lisa Brown for NPR