Hiroshima buildings found in beach sand

Geologists from the University of California, Berkeley, found something unexpected in sand samples from Japan. Rather than natural particles, from rocks or plants, these tiny blobs of glass seem to have been formed in an atomic blast, and they might mean that the destroyed buildings of Hiroshima have been hiding in plain sight ever since. Ruby Osborn spoke to Mario Wannier about his research, which has been published in the journal Anthropocene...