Most mathematicians study mathematics because they find it a beautiful subject.

Listen to Poincare, one of the greatest mathematicians of the 20th century describe his addiction to the beauty in his subject…"The scientist does not study Nature because it is useful; he studies it because he delights in it, and he delights in it because it is beautiful. If Nature were not beautiful, it would not be worth knowing, and if Nature were not worth knowing, life would not be worth living."

Despite most mathematicians’ obsession with the beauty of their subject, mathematics still remains the best language to negotiate the complexities of the real world. In particular, mathematics is behind many of the technical innovations we take for granted in our high-tech world.

In this section we shall explore how even the primes have become essential tools in building the electronic super-highway.