A tragic bridge collapse in Miami echoes a similar event in Minnesota over a decade ago, one of the first signs of America’s growing infrastructure problem.

As gaming becomes the dominant form of entertainment this century, game developers increasingly track player behavior to tailor experiences that will keep people playing longer and spending more money.

We’ve teamed with PBS’ American Experience to take a look back at Freeman Dyson, who explored whether interplanetary space travel could be made possible by harnessing the power of a nuclear bomb.

Catastrophic accidents at power plants have heightened fears about the safety of nuclear energy, but environmentalists and others are giving it renewed attention as a way to fight global warming.