So there I am, standing in the shadow of one of the seven modern wonders of the world at Chichen Itza in the Yucatan Peninsula in Mexico – the cradle of Mayan civilization – enjoying the history and awesome scenery of the ancient temples when my son tugs on my shirt.“Look,” he says holding up a normal looking rock. “I found another rock.”Seemingly oblivious to the large stone temples that surrounded us on every side, my 10-year-old plunges the rock into his bright pink bag and goes about looking for more samples like a prospector looking for gold during the California gold rush. “Henry, look at all of this,” I say, pointing to the temples all around.