A uranium cube believed to be part of Hitler's plot to build a nuclear bomb is being investigated by scientists.
They suspect it may have been sent to German scientist Werner Heisenberg who was the mastermind behind the Nazi's race to develop a nuclear reactor during the Second World War.
The palm-sized block is also suspected of being handled by Germany Army physicist Kurt Diebner who was investigating military applications of fission - the splitting apart of atoms.
A US team has reported initial results from a study expected to confirm its provenance.
