It suggested that the bug might be an intermediary, a vector, for the transposon. Next morning, he alerted two of his postdocs and invited them to investigate. Further scanning the bug’s genome, they found not just Space Invaders, represented in more than two hundred copies, but also three other transposons known previously in mammals. From the evidence of mutation rates, the transfers seemed to have happened within a time range of fifteen million to forty-six million years ago.
