Keep a sense of proportion.

We do seem to have gone overboard about this Polonium 210 business (I have to admit I thought polonium was what my Mum used to put on my sandwiches!). Obviously the whole business is very worrying, but as I understand it, you would have to have been pretty intimate with Mr Litvinenko to have picked up anything vaguely approaching a worrying amount of radiation, so why we're making such a big thing about insignificant (health-wise, that is) traces found here and there is beyond me. All we're doing is risking worrying people unnecessarily.