Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Robyn Williams: Alan Turing. What do you know about Alan Turing, who was born 100 years ago this month?

When he invented Turing machines in 1936, Alan Turing also invented modern computing. In 1928, the German mathematicians David Hilbert and Wilhelm Ackermann proposed a question called the ...