The development of different bees from the same DNA in the larvae is one of the clearest examples of epigenetics in action - mechanisms that go beyond the basic DNA sequence," said co-author Mark Dickman from the University of Sheffield.
With just two days to go until Christmas, rail services have been suspended and many roads are flooded. In Devon, one woman was rescued by a police helicopter after she was swept away by floodwater and left clinging to a tree.
Euro MPs have voted to tighten tobacco regulations aimed at putting young people off smoking, but some measures do not go as far as originally planned.