In 1996 in the Egyptian Museum in Cairo, Italian mineralogist Vincenzo de Michele spotted an unusual yellow-green gem in the middle of one of Tutankhamun's necklaces.
The jewel was tested and found to be glass, but intriguingly it is older than the earliest Egyptian civilisation.
Working with Egyptian geologist Aly Barakat, they traced its origins to unexplained chunks of glass found scattered in the sand in a remote region of the Sahara Desert. But the glass is itself a scientific enigma. How did it get to be there and who or what made it?

Reagan examines the enigmatic career of one of the revered architects of the modern world - icon, screen star, and two-term president Ronald Reagan.

Fascinating movie spans the globe to reveal recent discoveries about water, the most amazing yet least studied substance in the world. Witness as researchers, scientists, philosophers and theologians try to understand this unique liquid and all its miraculous properties still waiting to be discovered.

TV series 2003– . Stephen Fry hosts the mind-expanding quiz in which the aim is to be interesting. Stephen plays I-Spy with Sandi Toksvig, Lee Mack, Jimmy Carr and Alan Davies. Full summary »

As the Torchwood team launch a final, desperate mission against the seemingly undefeatable Three Families, they realize it may come down to the ultimate sacrifice