This story appears in the April 2013 issue of National Geographic magazine. Tusk and Sunset A mammoth’s tusk spikes the Siberian sky on Bolshoy Lyakhovskiy Island. Tusks that are discovered with ...

This story appears in the January 2011 issue of National Geographic magazine. “Past the hand of dog, watch out for dinosaurs,” says a voice in the dark. I recognize Jonathan Sims’s clipped ...