Ask an Expert Locator: 
        A list of sites where you ask experts questions.

     http://www.vrd.org/locator/subject.shtml


The Science Club "Ask Science Questions" sites: 
        Links to numerous sites where you can get your science questions answered.

     http://scienceclub.org/kidquest.html


Scientific American- Ask the Experts: 
        Ask the experts at Scientific American magazine questions on related subjects.

     http://www.sciam.com/askexpert_directory.cfm