About 2,000 feet deeper than the Grand Canyon, Hells Canyon was rapidly carved when a lake spilled over about 2.1 million ...

Emily Garthwaite / INSTITUTE We left the office under a blazing summer sun, stepping over the remains of mud-brick walls and slowly climbing as we crossed the city. A hot wind kicked up ancient soil.

Looking to inspire the next generation of curious minds? These are our picks of the best popular science books for children ...