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One question for Matt Killingsworth, a psychologist at the University of Pennsylvania.

An artwork, sculpted with science, defines our times.

Nearly every evolutionary question can find an answer in mucus.

Nuclear winter is just the beginning.

Your brain is not the root of cognition.

One question for Jillian Scudder, astrophysicist and author of “The Milky Way Smells of Rum & Raspberries.”

A parasite infection can make a leader of the pack—or a dead wolf.

Richard Feynman’s path integral is both a powerful prediction machine and a philosophy about how the world is. But physicists are still struggling to figure out how to use it, and what it means.

A universe of microbes is melting with Arctic ice—with consequences for us all.

We are formed by more than DNA. Meet the bioelectric code.

One question for Ralph Chami, assistant director at the International Monetary Fund.