The Village Where "Falling Rocks" is Serious Business

Mountains are a literary metaphor for something that is eternal and immovable, but that's not always so in the real world. Mountains are subject to both gravity and entropy. The village of Brienz in Switzerland is itself moving as the ground shifts underneath, but the mountain above the village is falling apart, sending boulders rolling into the valley. How do these people live with the danger? The highway that runs across the foot of the mountain is in even more danger from falling rocks, but Swiss engineering is on it. No, they can't stop the rocks, but they can make the road safe enough for travelers. Tom Scott has the story.