The chinese mathematican
Chen Jing-Rung has made a big step towards solving the Goldbach
's conjecture in 1966. He was able to prove that each even
number bigger than 2 is the sum
of a prime number
and the product
of two prime numbers. So 20 is the sum of 5 and 15, what is the product of 5 and 3. This seems to be very near to the prove of Goldbach's conjecture but in the last thirty years no one was able to make the last step.
The american publishing house "Bloomsbury" and the english "Faber" offer a prize of one million US Dollar to the person who publishes the prove in the next four years.