Google once again is calling on students ages 13 to 18 to participate in an online science fair. The 2012 Global Science Fair, which follows last year's inaugural event, challenges students to submit projects that will be judged by a panel of scientists and researchers. Have you asked a question today? What did you do with it?  Did it take you somewhere new? Did it bring you here?  The Google Science Fair is an online science competition seeking curious minds from the four corners of the globe. Anybody and everybody between 13 and 18 can enter.   All you need is an idea.