In this third installment in the Ancient Technology series, join David Hatcher Childress in Costa Rica, Nicaragua and Mexico as he searches for evidence of high technology in the ancient past. Going to ancient cities and megalithic sites, David and friends examine evidence of ancient technology that is simply mind-blowing! David and his team check out the giant stone balls in Costa Rica, and move on to examine the mysterious megalithic statues on a remote island in Nicaragua. Then they continue to the colossal basalt heads of the Olmecs in Mexico. Did the Olmecs have power tools? 1:04 min