Saturday March 20, 2010 Updated 10:45 PM PDT
The ringed planet Saturn, brilliant jewel of the night sky, has revealed new insights into the behavior...
Tuberculosis infections in the United States dropped by an unusual and unexpectedly large 11.4 percent...

Scientists for decades have lumped Asians into one homogenous group when studying conditions like breast cancer and heart disease...
Chronicle 3.19.10 4:00 AM
Warning to criminals: Rubbing out your fingerprints may no longer be enough. Your germs could still give you away. It turns out the...
Chronicle 3.16.10 4:00 AM
In the long evolution of reptiles, the venomous rattlesnakes and their ilk have developed a highly sensitive way to spot their prey...
Chronicle 3.15.10 4:00 AM
The original manuscript of Albert Einstein's groundbreaking theory of relativity, which helps explain everything from black holes to...
Chronicle 3.14.10 4:00 AM
The Vino-Lok looks like a glass artist's take on a button mushroom. A smooth, thick disk caps a tapered, stubby stem. It is weighty in...
Chronicle 3.14.10 4:00 AM
At least three major aftershocks rocked central Chile on Thursday, striking minutes before its president-elect was sworn into office...
Chronicle 3.12.10 4:00 AM
Slow Death by Rubber Duck The Secret Danger of Everyday Things By Rick Smith and Bruce Lourie (Counterpoint; 328 pages; $25) Poor...
Chronicle 3.12.10 4:00 AM

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