I'm not sure that science stars are all that helpful. Something they can be self-aggrandising publicity whores that, instead of really educating the public, obfuscate the sciences by offering vacuous factoids on fields they have only a passing acquaintance with. At the same time, science popularizing takes time away with their own research.
Michio Kaku's a good example: once a fine research physicist, he has now become the media's go-to man whenever they want to look deep, even if it is on something outside his field like climate change or UFOs. (The signs of losing rigor were showing already in the early '90s with his first popular science book Hyperspace [amazon.com], which seemed curiously obsessed with -- and optimistic about -- humanity gaining "god-like powers").
Some might counter that these folks do good in attracting young people to the sciences, but I would like to see some hard figures on that. I suspect the bureaucrats that quietly set educational policy, not media go-to scientists, can have a much, much greater effect.
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