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A new study from the Karolinska Institute and Stockholm School of Economics shows that the brain has built-in mechanisms that trigger an automatic reaction to someone who refuses to share. In the study publishing next week in the online open access journal PLoS Biology, the subjects' sense of justice was challenged in a two-player monetary fairness game, and their brain activity was simultaneously measured using functional magnetic resonance imaging (fMRI). When bidders made unfair suggestions as to how to share the money, they were often punished by their partners even if it cost them. This reaction to unfairness could be reduced by targeting one specific brain region, the amygdala.

Chinese hackers temporarily brought down the world's fastest-growing social action platform after more than 90,000 people in 175 countries endorsed an online call for the release of internationally acclaimed Chinese artist Ai Weiwei. Weiwei, best known for his role in the construction of the Beijing Olympic stadium and his recent Sunflower Seeds exhibition at the Tate Modern, has become an increasingly outspoken critic of the Chinese government in recent years, in particular over the handling of the 2008 earthquake in the country's Sichuan province.

Smartphone apps may be the key to getting people out of their cars and onto mass transit. An interesting study of commuters in Boston and San Francisco found people are more willing to ride the bus or train when they have tools to manage their commutes effectively. The study asked 18 people to surrender their cars for one week. The participants found that any autonomy lost by handing over their keys could be regained through apps providing real-time information about transit schedules, delays and shops and services along the routes. Though the sample size is small, the researchers dug deep into participants' reactions. The results could have a dramatic effect on public transportation planning, and certainly will catch the attention of planners and programmers alike. By encouraging the development of apps that make commuting easier, transit agencies can drastically, and at little cost, improve the ridership experience and make riding mass transit more attractive.

The immune system recognizes and neutralizes or destroys toxins and foreign pathogens that have gained access to the body. Autoimmune diseases result when the system attacks the body's own tissues instead. One of the most common examples is multiple sclerosis (MS). MS is a serious condition in which nerve-cell projections, or axons, in the brain and the spinal cord are destroyed as a result of misdirected inflammatory reactions. It is often characterized by an unpredictable course, with periods of remission being interrupted by episodes of relapse.

A full hour before the formal announcement of Bin-Laden's death, Keith Urbahn posted his speculation on the emergency presidential address. Little did he know that this Tweet would trigger an avalanche of reactions, Retweets and conversations that would beat mainstream media as well as the White House announcement. Keith Urbahn wasn't the first to speculate Bin Laden's death, but he was the one who gained the most trust from the network. Why did this happen?

As Japan grapples with an unprecedented triple disaster - earthquake, tsunami, nuclear crisis - the Web has spawned creativity and innovation online amid a collective desire to ease suffering.