We trust first in God and then our team of doctors. These were among the last words of Ladan and Laleh Bijani, the conjoined twins who died after a 50-hour operation to separate them. Perhaps it was their faith that explained their marvellous optimism. In Iran, where they were deserving celebrities, people stopped and wept in the street when the news of their deaths interrupted television and radio broadcasts. How could this be God's will?