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Pew's latest survey shows Twitter is growing up, getting used more, and appealing to more older users. It's also a mobile affair for everyone half the time. With rumors Apple's about to integrate it, this could all become more significant

Quantum mechanics is the most successful description of nature known to humans, yet it has many bizarre implications for our understanding of the world. There are phenomena of superposition (objects being in two places at the same time), entanglement (correlations that exceed any classical correlations) and nonlocality (apparent ability for information to travel instantaneously across vast distances)

Editor's note (6/1/2011): We are making the text of this July 1985 article freely available for 30 days to coincide with the publication of a paper on entropy and quantum systems by Vlatko Vedral. He authored our June 2011 cover story and blogs about his latest work , which discusses the research featured in this 1985 article. A computation, whether it is performed by electronic machinery, on an abacus or in a biological system such as the brain, is a physical process

Smoking marijuana before age 15 tied to impairments in attention span and impulse control

Rebecca Jarvis talks to "Early Show" medical correspondent Dr. Jennifer Ashton about a new report linking cell phones and brain cancer and finds out what can be done to limit health risks

It's a sniffer dog with a difference: a military Belgian Shepherd that has been trained to detect signs of prostate cancer in patients' urine. According to French scientists, the dog can do it far more accurately than any currently available scientific technique. Felipe Maya reports.

New study suggests violent video games promote aggression by desensitizing them

People who suffer from chronic fatigue syndrome were dealt another blow this week when it became clear that researchers still fail to understand the genesis of this disease. Perhaps most importantly, these patients are being advised to stop taking antiretroviral medications.

It's been partly hidden for months, hotly anticipated since HP bought Palm and ditched its plans for a Windows tablet, and now here it is via a seemingly

Program pulls entrepreneurs from college into full-time inventing; each fellow gets $100K to get start-up company to work