Earth's surface is covered in weird and wonderful patterns. The Australian outback is covered in pale spots, the work of wombats; a clearing in the endless green canopy of the Congo rainforest has been created by an incredible elephant gathering; and the twists and turns of the Amazon make a home for rehabilitated manatees. This is our home, as we've never seen it before.

The meteoric rise of renewable energy has consequences for our electricity supply. While coal and gas fired power stations can generate electricity whenever you need it, renewables are intermittent by nature. So we need a backup plan for when the wind stops or the sun goes down.
All over the world, engineers and scientists are racing to solve one key problem; how to safely and efficiently store electricity at a huge scale but at a low cost. The quest is producing some truly remarkable ideas and this episode details three of them.

More than 2,000 years ago, the thriving city of Petra rose up in the bone-dry desert of what is now Jordan. An oasis of culture and abundance, the city was built by wealthy merchants whose camel caravans transported incense and spices from the Arabian Gulf. They carved spectacular temple-tombs into its soaring cliffs, raised a monumental Great Temple at its heart, and devised an ingenious system that channeled water to vineyards, bathhouses, fountains, and pools. But following a catastrophic earthquake and a slump in its desert trade routes, Petra's unique culture faded and was lost to most of the world for nearly a thousand years. Now, in a daring experiment, an archaeologist and sculptors team up to carve an iconic temple-tomb to find out how the ancient people of Petra built their city of stone. Meanwhile, scientists using remote sensors and hydraulic flumes uncover the vast city and its sophisticated water system. The race is on to discover how these nomads created this oasis of culture in one of the harshest climates on Earth.

Guernica (1937) was created during Picasso's Surrealist period and captures the horror of the bombing of the Basque town of Guernica during the Spanish Civil War. By the end of World War II, Picasso had become an internationally known artist and celebrity.

P.U.L.S.E is a Pink Floyd concert video taken from the 20 October 1994 concert at Earls Court, London. PULSE records the great psychedelic band Pink Floyd rocking out like only they can. Renowned for their hallucinatory special effects and lighting schemes, Pink Floyd goes all out at this spectacular (and very long) concert. Twenty-one of their classics are performed, including classic rock radio staples 'Dark Side of The Moon' and 'Wish You were Here". There was considerable delay in the release of the video edition of Pulse. The cause of the delays was reputed to be the continued modifications and additions to produce a high-quality release. The previous planned release date of 22 September 2005 for the two-disc DVD set was changed to 10 July 2006 for the UK and Europe, and 11 July 2006 everywhere else.

P.U.L.S.E is a Pink Floyd concert video taken from the 20 October 1994 concert at Earls Court, London. PULSE records the great psychedelic band Pink Floyd rocking out like only they can. Renowned for their hallucinatory special effects and lighting schemes, Pink Floyd goes all out at this spectacular (and very long) concert. Twenty-one of their classics are performed, including classic rock radio staples 'Dark Side of The Moon' and 'Wish You were Here". There was considerable delay in the release of the video edition of Pulse. The cause of the delays was reputed to be the continued modifications and additions to produce a high-quality release. The previous planned release date of 22 September 2005 for the two-disc DVD set was changed to 10 July 2006 for the UK and Europe, and 11 July 2006 everywhere else.