Tucked away in Siberia, there are furry, four-legged creatures with wagging tails and floppy ears that are as docile and friendly as any lapdog. But despite appearances, these are not dogs-they are foxes. They are the result of the most astonishing experiment in breeding ever undertaken-imagine speeding up thousands of years of evolution into a few decades. In 1959, biologists Dmitri Belyaev and Lyudmila Trut set out to do just that, starting with...