The operating manual of a human being is written in each of its cells, in a DNA molecule about two meters long, folded in an unimaginable way, with the instructions to transmit a thought, dance a dance or hum a song. The first absolutely complete read of a person's DNA—their genome—has revealed an unknown world of redundant sequences. It's counterintuitive, but these repeated stretches in a human being's DNA precisely help make them unique.
