Dr Richard Clay goes in search of what it is that has made us scribble and scratch mementoes of our lives for more than 30,000 years. From the prehistoric cave paintings of Burgundy in France, through gladiatorial fan worship in Roman Lyons to the messages left on the walls of Germany's Reichstag in 1945 by triumphant Soviet troops, time and again we have wanted to leave a permanent record of our existence for our descendants. And it may be that this is where what today we call art comes from - the humble scratch, graffiti.

A Brief History of Graffiti

Big numbers of polar bears come to the same spot in Alaska at the same time every year.

The Great Polar Bear Feast

Yetenekli futbolcuya yakın kişilerle yapılan röportajlar, onun zamansız ölümüne katkıda bulunabilecek farklı faktörleri ortaya koyuyor.

What Killed Maradona?

Eyewitnesses give first hand testimony about the worst natural disaster to strike Britain in modern times. On 31 January 1953, a massive storm and its huge tidal surge flooded 250 square miles of land from the Shetlands to the Thames estuary, killing hundreds of people, sinking several ships, and destroying tens of thousands of homes. Few remember this disaster that shocked the country as it emerged from the trauma of World War II, but those who do remember it vividly.

The North Sea Flood of 1953

How the 1948 Olympic Games came into being, as the world struggled to cope in the aftermath of the Second World War, and the Games were held for the first time in 12 years. With Britain in the midst of widespread poverty and rationing, hosting the event seemed unlikely, but existing venues were renovated despite a low budget and little time to play with, and the British people pulled together to make the Games a success.

London 1948: The Austerity Olympics

Exploring one of the most devastating but little-known disasters in London's history, this documentary reveals the shocking events that unfolded during the fateful Thames Flood of 1928.