Rapa Nui legend held that the giant stone heads on Easter Island, known as moai, walked from the quarries where they were carved to the platforms on which they now stand. As astonishing as it seems, scientists consider this to be a leading explanation for the statues’ movement. Video (1:46) Regardless of how the moai arrived at their destinations, it’s a good guess that the Rapa Nui tried a few things first, to determine what was most effective. Effectiveness is the degree to

A study at Harvard concluded that when people are faced with a chronic lifestyle disease—diabetes, heart disease, smoking, chronic stress—and their doctor says, "Hey look, here's the deal. You really have to change your ways, and if you don't it might kill you," seven out of eight of us would rather die than change. * Why is it so difficult for us to act, and how can we change? I would be presumptuous to suggest I have solved this, but I can share some thoughts. I will examin