The Movement Issue
People, goods, ideas, atoms -- there is almost no limit to what moves in our world. In this issue, we explore this exchange and its effects.
Experts in medicine and engineering are using new technology to learn why ACL tears, a devastating sports injury to the knee, occur -- as well as how to prevent them from happening.
More than a half-century after streetcars were abandoned and burned, at least a dozen U.S. cities are working to revive them.
A century ago, more automobiles were powered by electricity than by gasoline.