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The Sharps’ story is a reminder that in the last great refugee crisis, in the 1930s and ’40s, the United States denied visas to most Jews. We feared the economic burden and worried that their ranks might include spies. It was the Nazis who committed genocide, but the U.S. and other countries also bear moral responsibility for refusing to help desperate people.

Why is Stalin now gaining popularity? For one, people remember less and less about his purges and prison camps — which in Russia began to be thoroughly investigated and openly discussed only in the 1980s. As the sharp edges of Stalin’s image have gone out of focus, he has become what Ilya Budraitskis, a leftist thinker and activist, described to me as an “empty shell that can be filled with different meanings.”

The most suggestive evidence for such transgenerational transmission may come from a macabre human experiment. In September, 1944, amid the most vengeful phase of the Second World War, German troops occupying the Netherlands banned the export of food and coal to its northern parts. Acute famine followed, called the Hongerwinter—the hunger winter. Tens of thousands of men, women, and children died of malnourishment; millions suffered it and survived. Not surprisingly, the children who endured the Hongerwinter experienced chronic health issues. In the nineteen-eighties, however, a curious pattern emerged: when the children born to women who were pregnant during the famine grew up, they had higher rates of morbidity as well—including obesity, diabetes, and mental illness. (Malnourishment in utero can cause the body to sequester higher amounts of fat in order to protect itself from caloric loss.) Methylation alterations were also seen in regions of their DNA associated with growth and development. But the oddest result didn’t emerge for another generation. A decade ago, when the grandchildren of men and women exposed to the famine were studied, they, too, were reported to have had higher rates of illness. (These findings have been challenged, and research into this cohort continues.) “Genes cannot change in an entire population in just two generations,” Allis said. “But some memory of metabolic stress could have become heritable.”

Unsurprisingly, it was the friendly competition element that captured the attention of Traynor's primary school pupils learning Spanish. “As soon as they come into the classroom, they want to see where they are on the leader board,” he says. And there are other advantages. Each lesson, Traynor tends to split the class into two – while half are doing the “spade work” on vocabulary learning on the school's iPads, he can teach the others – before the two halves switch over. By working with these smaller groups, he can then give more individual attention to each child's understanding of the grammar.Even more powerfully, Traynor recently began encouraging his class to record and upload their pronunciation of the words onto the app – which they can then share with their classmates using the course. The sound of their classmates seems to have spurred on their enthusiasm, says Traynor. “They're constantly trying to work out whose voice they're hearing,” he says. “So they're giving more attention to the different sounds. I think it's improved their speaking and listening dramatically.”Although most courses on Memrise deal with foreign languages, teachers in other subjects are also starting to bring the technology to their classroom. Simon Birch from The Broxbourne School in Hertfordshire, for instance, uses it to teach the advanced terminology needed for food technology exams, while his school’s English department are using it to drill spelling. "The benefits for literacy can't be overstated," Birch says.