Ben Miller investigates scientific accuracy. He meets researchers working with extremes of temperature, and experiences some of the strangest effects of quantum physics. Show more
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As a gas cloud strayed within the gravitational reach of a black hole at the centre of the Milky Way, it was hoped we would observe a feeding supermassive black hole in action. Show more
Sir Dave Brailsford and other insiders tell the story of the extraordinary triumphs and recent controversies that have rocked Britain's cycling medal factory. Show more
Lost Cities of the Ancients
Episode 3: The Dark Lords of Hattusha
1 hour
First broadcast: on BBC One SouthLatest broadcast: on BBC Four HD
Documentary series on lost civilisations. The story of the formidable Hittite empire and the rediscovery of their astonishing capital, Hattusha. Show more
Lost Cities of the Ancients
Episode 2: The Cursed Valley of the Pyramids
1 hour
First broadcast: on BBC One SouthLatest broadcast: on BBC Four HD
Documentary series which unearths lost civilisations and cities. This edition visits northern Peru to find the ruins of 250 mysterious pyramids. Show more
Lost Cities of the Ancients
Episode 1: The Vanished Capital of the Pharaoh
1 hour
The documentary series which unearths lost cities looks at the mystery surrounding the Egyptian city of Piramesse, built by Ramesses the Great. Show more
Richard Hammond's Invisible Worlds
Episode 2: Out of Sight
59 minutes
First broadcast: on BBC HDLatest broadcast: on BBC Two Northern Ireland
Richard Hammond uses groundbreaking imaging technology to take the viewer on a journey of discovery beyond the visible spectrum, seeing the world in a whole new light. Show more