Teachers trained to make silk suspended their cocoons over cauldrons of boiling water. They used them in experiments, dissected for the children’s biological education. By return, students fed and attended to the silkworms. The little caterpillars were weaponized as instruments of biological instruction of ‘racial hygiene’. It was easy to grasp. Even a child could successfully breed healthy silkworms, so long as all those that were weak, or sick, were removed and destroyed as soon as they were identified. At the same moment that Churchill steeled Britain’s air force to wage war in the skies, Hitler recruited silkworms to the...