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Scientists still don't entirely comprehend the 1.5 billion year history of the Grand Canyon; it's a story of erosion that has created one of the most breathtaking sites in America.
Surrounded by four of America's Great Lakes, Michigan has more freshwater shoreline than any other state. Each of its shores has its own unique landscape, from forests, to beaches, to giant walls of sand.
A weapons expert and a trauma surgeon recreate a scene from Platoon using high-speed cameras to show the damage caused by a single M16 bullet to the human body.
When all of the systems suddenly shut down on this A380 plane, it's up to the captain to land the largest passenger jet in the world - while flying blind.