Feature
- Tech
Taming High-Tech Particles
Researchers are beginning to study whether nanomaterials could have unintended negative consequences in the human body or the environment.
- Physics
The Black Hole Next Door
Microscopic black holes—fleeting replicas of the huge, matter-gobbling ones in space—may be detected soon in our atmosphere and at a big particle collider now being built.
- Earth
Water for the Rock
A long-popular theory about how Earth got wet—that the oceans are puddles left by an ancient rain of comets—doesn't seem to hold water, and new hypotheses suggest that the celestial pantry is now empty of a key ingredient in the recipe for Earth.
