In today's world, interactive media is a normal part of our everyday lives.
It might surprise you, though, to learn that it is a full 40 years since
the launch of the world's first ever interactive film.
"Kinoautomat", as the system was called, was a hit as
Czechoslovakia's entry at the 1967 Expo - before the country's communist
authorities effectively killed it off. Now however, four decades later, it
has been revived in Prague.