The grueling 135-mile journey of a 66-year-old runner through one of the hottest places on Earth For 37 years in a searing California desert, runners from across the globe have embarked on a 135 ...

But researchers disagree on exactly how old they are. Work from two decades ago suggested the rocks could be 4.3 billion years old, placing them in the earliest period of Earth’s history.

For 37 years in a searing California desert, runners from across the globe have embarked on a 135-mile race through one of the hottest places on Earth.