A new rain storm is bearing down on California, including fire-ravaged Los Angeles, where residents are bracing for the possibility of mudslides and landslides.

Areas scarred by the Eaton Fire are at “high to very high risk” of debris flows this week. How do they happen? What is being done to prepare for storms?

When hills are healthy, vegetation can anchor the soil in place. But when that is burned off, hillsides become vulnerable to erosion, and slopes can come crashing down.

After the Southern California wildfires burned tens of thousands of acres last month, thousands of Angelenos are returning home for the first time in weeks.

The Italian mountaineer Carel wants to be the first man to stand on the top of the Matterhorn. Since the climb is very difficult, he agrees to try it together with the British mountaineer Whymper. But ...

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