Vitali Prokopenko with his daughter, Sasha (9) who has hydrocephalus - fluid on the brain. Vitali believes Sasha's condition is the result of living in a contaminated region. He says, 'This must be very difficult for you. You have probably never seen anyone with such a big head, but to us she is our most beautiful daughter.' On 26th April, 1986, at 1.23am the world's worst nuclear disaster happened at Reactor Number 4 at Chernobyl nuclear power station in northern Ukraine. 190 tons of highly...