Feature
- Planetary Science
Pluto: A timeline of 85 years of discovery
Several observations in the last 85 years have given astronomers a little more information about Pluto, and the July 2015 flyby will offer the closest look yet at the solar system's far-flung satellite.
- Physics
The arrow of time
Gravity may explain how time always runs forward, even though the laws of physics should permit it to run backward.
- Health & Medicine
E-cigarettes proving to be a danger to teens
E-cigarettes have surpassed cigarettes as the most commonly used tobacco product among teenagers. Medical researchers are sounding the alarm.
- Quantum Physics
Quantum dots get a second chance to shine
Quantum dots, semiconductor particles that can emit a rainbow of colors, have been put to work observing living cells, with possible benefits for medical diagnosis.
