Alex Smith, a 20 year old Birmingham undergraduate, has been awarded the Wolfram prize
for proving that the (2,3) Turing
machine is universal. This is a very basic machine with a three letter alphabet (say 0,1 and 2) and only two states, obeying the state diagram
where $m:n$ represents a substitution of the letter $m$ for the letter $n$. The third number on an arrow labels the offset of the head for that move.
that such a universal machine could be used as a basis for building computers from simple molecules, such as DNA.