Perhaps some clue is offered by a 220 000-year-old crater site just north of Pretoria, Tswaing, one of the best-preserved impact craters on our planet. Formed by a stony meteorite rather than a ...

About 220,000 years ago, a meteor slammed into a corner of South Africa creating the Tswaing Crater. Today, it's a hotbed of wildlife and exotic vegetation, drawing tourists from all over the world.