This week’s big Apple announcement featured one big disappointment: Apple TV’s relative lack of, well, TV. Out of all of the hundreds of channels available on cable and satellite, only ABC and Fox agreed to offer their programs for rent on Apple TV. The fact that Steve Jobs is the largest single shareholder in, and on the board of, Disney — owner of ABC — perfectly illustrates this digital divide.

Unlike infectious disease and information, behavior change spreads faster through online networks that have many close connections instead of many distant ties. Redundancy is key, as people are more likely to engage in a behavior if they see many others doing it. "There has been a lot of theory about the difference between information and behavior spreading," said economic sociologist Damon Centola of MIT and author of the study published Sept. 3 in Science. "We've assumed that they are the same, but you can imagine that behavior is not really like that, that you need to be convinced."

A new batch of sharp Martian close-ups from NASA's HiRISE camera were released, and we've gathered some of the best in the gallery.

A creepy caricature of Google CEO Eric Schmidt driving an ice cream truck is being displayed on a Times Square jumbotron and on YouTube. The video was produced by a consumer group targeting the search giant for its data collection practices.

The atmosphere of a young exoplanet didn't fit any of our existing models for what gas giants should look like. But when astronomers added huge dust clouds, it was a perfect fit, perhaps revealing a larger truth about gas giants.

Magnetic minerals in 15-million-year-old rocks appear to preserve a moment when the magnetic north pole was rapidly on its way to becoming the south pole, and vice versa.

Development Seed is engineering tools to create custom maps that work in a wider variety of situations such as natural disasters and in the developing world.

A reinterpretation of the fossil record suggests a new answer to one of evolution's existential questions: whether global mass extinctions are just short-term diversions in life's preordained course, or send life careening down wholly new paths.

The official Twitter app for iPad is finally here, and star developer Loren Brichter has polished yet another gem. Twitter for iPad sports a really elegant interface that's significantly faster and more intuitive than competing Twitter clients we've tested (such as Twitterific and Tweetdeck).

Fujitsu's scanner is your new (albeit bulky) buddy if you want high-quality images. The sturdy document feeder gets pages in straight, so you get them out right.

Google is celebrating the second birthday of its Chrome web browser with the release of Chrome 6. Among the new features are an updated user interface, auto-fill for web forms, extension syncing, increased speed and numerous bug fixes.

People in Silicon Valley have focused on the set-top box as the lever to attack the cable industry. Cable boxes blow, but that's a losing battle. So why is Apple TV different? Because Steve Jobs has not just created a new set top box. He's actually created a whole new media ecosystem built around the mobile phone.

It looks like a motorcycle, it performs like a Lotus and it's racing around the world.

String theory has finally made a prediction that can be tested with experiments — but in a completely unexpected realm of physics: quantum entanglement.

Chemical analysis of the bones of an ancient Sudanese Nubians who lived nearly 2,000 years ago shows they were ingesting the antibiotic tetracycline on a regular basis — likely from a special brew of beer. The find is the strongest yet to support that antibiotics were previously discovered by humans before Alexander Fleming discovered penicillin in 1928.

Samsung has announced the launch of a tablet that could become the first major Android-powered challenger to the Apple iPad.