As a geologist who studies Stone Age cave art, Iñaki Intxaurbe is used to making subterranean treks in a headlamp and boots. But the first time he navigated a cave the way humans thousands of years ago would have — barefoot while holding a torch — he learned two things. “The first sensation is that the ground is very wet and cold,” says Intxaurbe, of the University of the Basque Country in Leioa, Spain. The second: If something chases you, it will be hard to run. “You are not going to see what is in front of you,” he says.
Torches are just one of several light sources Stone
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