Prime numbers
Have you heard about prime numbers? They're unique, inexplicable, and they can do the most amazing things. The experts' view:
An underground movement
Developing beneath the soil and then bursting forth in massive numbers - solve the mystery of the cycling cicada.
Searching for the rhythm
The work of Gauss and Riemann looked past the apparently random nature of primes, discovering patterns and landscapes.
Primed radio
BBC Radio 4's The Material World featured prime numbers in December 2004. Follow the discussion as guests start talking primes.