This fossil is 13 million years older than any ant fossil found before—and reveals a sophisticated predator that lived alongside the dinosaurs.

One of the most intriguing discoveries in entomology was just made — not in the field, but in a drawer. Anderson Lepeco, an entomologist at the Museu de Zoologia da Universidade de São Paulo, had been combing through slabs of ancient rock in a collection from a little-known fossil site in northeastern Brazil when he saw something strange: a faint