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Is there a definitive line that divides crazy from sane? With a hair-raising delivery, Jon Ronson, author of The Psychopath Test, illuminates the gray areas between the two.

f you witnessed a crime, could you be sure you recognised the perpetrator? Our memories are surprisingly vulnerable, and our recollection of names, numbers and details can often be incorrect at the most crucial of moments.

Children are notoriously bad at delaying gratification to achieve later, greater rewards -and some are worse at waiting than others. Individual differences in the ability-to-wait have been attributed to self-control, in part because of evidence that long-delayers are more successful in later life (e.g.,Shoda, Mischel, & Peake, 1990. Here we provide evidence that, in addition to self-control, children's wait-times are modulated by an implicit, rational decision-making process that considers environmental reliability. We tested children (M= 4;6,N= 28) using a classic paradigm-the marshmallow task (Mischel, 1974)-in an environment demonstrated to be either unreliable or reliable. Children in the reliable condition waited significantly longer than those in the unreliable condition(p< 0.0005), suggesting that children's wait-times reflected reasoned beliefs about whether waiting would ultimately pay off. Thus, wait-times on sustained delay-of-gratification tasks (e.g., the marshmallow task) may not only reflect differences in self-control abilities, but also beliefs about the stability of the world.

For the past four decades, the "marshmallow test" has served as a classic experimental measure of children's self-control: will a preschooler eat one of the fluffy white confections now or hold out for two later? The original research began at Stanford University in the late 1960s. Walter Mischel and other researchers famously showed that individual differences in the ability to delay gratification on this simple task correlated strongly with success in later life. Longer wait times as a child were linked years later to higher SAT scores, less substance abuse, and parental reports of better social skills.

Scientists are testing the idea that the stress of modern city life is a breeding ground for psychosis

The UK's biggest ever online test into stress, undertaken by the BBC's Lab UK and the University of Liverpool, has revealed that rumination is the biggest predictor of the most common mental health problems in the country

How well do people remember? What is the best way to remember information? The results of this study could help answer these two questions. Everyone wants to be able to remember things. Students often stress over studying for a test. The purpose of this study is to determine which rehearsal method; highlighting words or writing them down while you study them, increases the recollection of the words. It is hypothesized that writing the words down while studying them would produce the highest number of words recalled. The results of this study suggest that it is easier to remember information if you write it down while studying it.

Games have long been accused of making players violent, but evidence has been building over the years that they can have positive effects. Scientists say they are not only understanding why, but they also trying to put these observations to the test.

When a new drug gets tested, the results of the trials should be published for the rest of the medical world - except much of the time, negative or inconclusive findings go unreported, leaving doctors and researchers in the dark. In this impassioned talk, Ben Goldacre explains why these unreported instances of negative data are especially misleading and dangerous.