If you've just joined us, the Nobel prize for Chemistry has been announced and it goes to a lone scientist from Israel, Daniel Shechtman for his discovery of quasicrystals.

The Nobel Foundation, meanwhile, has declared that Canadian scientist Ralph Steinman will keep his Nobel prize for medicine, after his death on Friday threw it into doubt. The rules state "work by a person since deceased shall not be considered".

But the foundation said it was unaware of Prof Steinman's death from pancreatic cancer and that the award had been made "in good faith".

Prof Steinman was announced the joint winner on Monday, along with Prof Bruce Beutler and Prof Jules Hoffman. Prof Steinman received the award for revolutionising the understanding of the immune system. He discovered the dendritic cell, which helps the body fight off infection.