First there was Richard Dawkins, who as Professor of Public Understanding of Science managed to put more people off science than practically anyone else with his hardline 'anyone who supports religion is an idiot' approach.
Now there's Susan Greenfield, charged with a similar task as the head of the Royal Institution. And guess what? According to Ben Goldacre, she's spreading scare stories (when she's not selling dubious brain training software).
I increasingly believe that scientists are the last people to have the job of improving public understanding of science. Let's give the jobs to popular science authors instead.