This story was originally published on July 19, 2022.
When paleoanthropologist Laura Shackelford first explored a tiny remote cave in northern Laos, she didn't expect to find anything compelling. She was used to working in sediment at the bottom of caves and didn't see anything of interest. But then she shined her flashlight towards the cave's walls and immediately noticed a mosaic of prehistoric teeth that had formed on its surface.
