“Within the first 24 hours, you had kids rolling around in what they thought was mud, but was really human waste,” one witness to the mayhem says in the documentary as footage shows young ...

Scientists on five continents are hunting for geological evidence to pinpoint exactly when humans became a major force shaping life on Earth. But settling on the date could unleash a larger debate.

Scientists on five continents are hunting for geological evidence to pinpoint exactly when humans became a major force shaping life on Earth. But settling on the date could unleash a larger debate.

Scientists on five continents are hunting for geological evidence to pinpoint exactly when humans became a major force shaping life on Earth. But settling on the date could unleash a larger debate.

Teams are studying 11 locations on five continents, looking for a place where rock, mud or ice perfectly capture the global impact of humans. As is often the case in science, the teams are both ...