The human eye is an amazing mechanism, able to detect anywhere from a few photons to a few quadrillion, or switch focus from the screen in front of you to the distant horizon in a third of a second. How did these complex structures evolve? Joshua Harvey details the 500 million year story of the human eye.
David Schwimmer explores an underground world of monsters and aliens. The largest gathering of the largest fish on the planet--over four hundred whale sharks--assembles in the same small patch of ocean just off Mexico’s Yucatan Peninsula. Why are they here? Mysterious Planet embarks on an epic journey to find out: from the clear blue waters of the Caribbean, into the largest network of flooded caves on Earth, spiritual underworld of a lost civilization, home to monsters and alien life forms ,where a meteorite the size of Manhattan is hurtling towards planet Earth, on course to kickstart the evolution of a whole new line of ocean giants.