The ancient Mayan ruins of the city Palenque lie in stark contrast to that of Egypt. But, these monuments share similar purposes. Egyptologist Kara Cooney searches for answers.
Pyramids served as a final resting place for ancient kings as well as a transformational device that turned them into gods. Tens of thousands of laborers were recruited to build these massive monuments.
This clip from Discovery Channel's, "Ultimate Guide to Sharks," examines how sharks use the ocean's vibrations as well as their excellent sense of vision to find their prey.