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Kids discover lying as early as age 2, studies have found. In one experiment, children were asked not to peek at a toy hidden behind them while the researcher withdrew from the room under false pretenses. Minutes later, the researcher returned and asked the child if he or she peeked.

“For lie detection to be an adaptive skill, that helps us to avoid liars and befriend truth-tellers, it doesn’t have to be conscious alarm bells. It could be more subtle,” ten Brinke says. “More of a feeling that you don’t really want to lend this person twenty dollars, that you’re not excited to go on a second date with this guy.” Ten Brinke and her colleagues decided to focus their efforts on finding evidence for unconscious lie detection.

Earlier this year, two forensic psychologists—Julia Shaw, of the University of Bedfordshire, and Stephen Porter, of the University of British Columbia—upped the ante. Writing in the January issue of the journal Psychological Science, they described a method for implanting false memories, not of getting lost in childhood but of committing a crime in adolescence. They modelled their work on Loftus’s, sending questionnaires to each of their participant’s parents to gather background information. (Any past run-ins with the law would eliminate a student from the study.) Then they divided the students into two groups and told each a different kind of false story. One group was prompted to remember an emotional event, such as getting attacked by a dog. The other was prompted to remember a crime—an assault, for example—that led to an encounter with the police. At no time during the experiments were the participants allowed to communicate with their parents.

Ranking The Battleground States

LYING may be an age-old part of politics, but it’s becoming easier to spot the fibs, fictions and falsehoods. A growing army of fact-checkers around the world is busy debunking falsehoods from presidents, prime ministers and pundits — and if their results are indicative, 2014 was a banner year. Some of the claims were so absurd that fact-checking groups honored them with awards, like Australia’s Golden Zombie and Italy’s Insane Whopper of the Year.Such lies are fun to read, but identifying them is serious business: Misinformation, unchecked, can turn elections, undermine public health efforts and even lead countries into war.

How big do the numbers have to be for insensitivity to begin? Not very, it turns out.

Consider the recent death of the Syrian child Aylan Kurdi when his family braved the choppy seas off the coast of Turkey. The image of Aylan lying face down on the beach captivated the world’s attention and even, in short order, resulted in refugee policy changes in countries as far away as the United States. But 14 Syrian children drowned in the Aegean Sea the next day. Did you notice? Did you care?

n a dissenting opinion in 1981, Supreme Court Justice William Brennan wrote that “eyewitness identification evidence is notoriously unreliable.” Dozens of scientific studies support this claim. Nevertheless, eyewitness testimony continues to be used widely, and many criminal cases hinge on it almost exclusively. Since 1989, two hundred and eighty people have been exonerated of sexual-assault charges in the U.S. Nearly three-quarters of those wrongful convictions relied, in whole or in part, on a mistaken identification by an eyewitness. Psychologists have long recognized that human memory is highly fallible. Hugo Münsterberg taught in one of the first American psychology departments, at Harvard. In a 1908 book called “On the Witness Stand,” he argued that, because people could not know when their memories had deceived them, the legal system’s safeguards against lying—oaths, penalties for perjury, and so on—were ineffective. He expected that teachers, doctors, and politicians would all be eager to reform their fields. “The lawyer alone is obdurate,” Münsterberg wrote.