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We tend to think that our memories determine our identity, but it’s moral character that really makes us who we are

Nor can you have formal moral systems without identity. The 18th-century philosopher Thomas Reid observed that the fundaments of justice – rights, duty, responsibility – would be impossible without the ability to ascribe stable identity to persons.

Why does our identity detector place so much emphasis on moral capacities? These aren’t our most distinctive features.

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.”

Until now, most executives in the airline industry have assumed that few people would be willing to book themselves and their families on unmanned flights—and they haven’t seriously considered turning commercial aircraft into drones or self-operating vehicles. By placing experienced fliers in the cockpit, the airlines signal to potential customers that their safety is of paramount importance—and not only because the crew members are skilled; their safety is at stake, too. In the language of game theory, this makes the aircraft’s commitment to safety more credible. Without a human flight crew, how could airlines send the same signal?

He said there had been "discrimination, deprivation and all manner of physical, sexual, emotional and mental abuse".

Yet because language is so central to being human, to have a language used only with certain other people is a powerful tool for connection and a sense of community. Few would deny, for example, that American Jews who still speak Yiddish in the home are a tighter-knit community, less assimilated into Anglophone American life and less at odds with questions about Jewish identity, than Jews who speak only English.

Thirty years later, a new word for this hatred was coined - "anti-Semitism". This was a time when race science was all the rage. Anti-Semitism avoided the connotation of pure hatred against individuals which is, after all, irrational. It focused scientifically on the supposed racial and social characteristics of a group, the Jews, without mentioning them by name. From there it was easy to start a political movement - based on scientific "facts" - to rein in a people who clearly were alien.