Dr. Dennis Bodewits , an astronomer who's been keeping an eye on Comet ISON provides some details on what we can expect as this “comet of the century” nears us later this year. Global immunization efforts and what's still needed to reduce the number of preventable deaths. Scientists and ag experts working to fight a deadly plant virus in East Africa Low prices for the HPV vaccine that protects against cervical cancer. Remember the movie Erin Brockovich?  Residents of the small California town portrayed in that movie are still having trouble with polluted groundwater. Science World Quick Quiz