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Perched atop a mountain crest, mysteriously abandoned more than four centuries ago, Machu Picchu is the most famous archeological ruin in the Western hemisphere and an iconic symbol of the power and engineering prowess of the Inca. NOVA joins a new generation of archeologists as they probe areas of Machu Picchu that haven't been touched since the time of the Incas and unearth burials of the people who built the sacred site.

Prairie Dogs are America's answer to the meerkat - small, sociable and exceptionally cute. This offbeat film narrated by Rob Brydon takes us to the Wild West where prairie dogs live in huge colonies known as 'towns'. Like meerkats they are comical to watch, but there is a whole lot more to prairie dogs than just being cute - they can talk. For 30 years Professor Con Slobodchikoff has been recording their calls in response to predators like coyotes, hawks and badgers. He believes he has discovered a language second only to humans in its complexity. It's a bold claim but is he right? Con has devised a series of cunning field experiments to help prove his point.

Historian Dan Snow charts the defining role the Royal Navy played in Britain's struggle for modernity - a grand tale of the twists and turns which thrust the people of the British Isles into an indelible relationship with the sea and ships.

The explosive story of chemistry is the story of the building blocks that make up our entire world - the elements. From fiery phosphorous to the pure untarnished lustre of gold and the dazzle of violent, violet potassium, everything is made of elements - the earth we walk on, the air we breathe, even us. Yet for centuries this world was largely unknown, and completely misunderstood. In this three-part series, professor of theoretical physics Jim Al-Khalili traces the extraordinary story of how the elements were discovered and mapped. He follows in the footsteps of the pioneers who cracked their secrets and created a new science, propelling us into the modern age.