Technology gives us access to the universe while at the same time creating risks to our continued existence. Does humankind’s best hope for long-term survival come down to leaving Earth behind?

The chief engineer for NASA’s robotic Mars Exploration Program talks about what it would take to put people on the Red Planet. Will Mars be humanity’s lifeboat?

A brief look at Mexico City’s history helps explain the modern city’s water troubles.

Mexico City is one of the world’s biggest population centers, yet the city’s infrastructure is extremely unstable. The resulting challenges serve as a warning—and a lesson—to the rest of our urbanizing world.

From genes to geophysics, our world is increasingly what we make it. But environmental philosopher Christopher Preston urges restraint.

If our reliance on technology has accelerated climate change, maybe technology can fix the problem too. Would it work? Should we try it?

Why does America’s Christian Right take such an active interest in how we view and use scientific findings—to the point of creating its own version of science?

Immortality may not be an option, but can degeneration and the terrors of aging be lessened or even eliminated? These authors think so.

We all know we have a “body clock” and that it’s slowly winding down. But researchers are learning more about just what that means.

Neurobiologist Michael Fossel explains how people’s healthy life spans can be extended and how he believes Alzheimer’s will soon be cured.