Free stuff: that's always a good way to get people's attention. If you're around Berkeley, California, this weekend, stop by the City of Berkeley's Green Home Expo, and make sure to bring something toxic, like an old mercury thermometer, computer monitor, or batteries. Some of this stuff will land you something new in exchange, and you'll be keeping toxics out of our environment. If you're not in the Bay Area, your local government may have a similar event, or take a minute with Google or a phone book to find out where to safely dispose of the following items. • Electronic waste • Household batteries • Unused Medications • Mercury Thermometers • Used cooking oil • Lead paint chips or dust Making your home greener sometimes means getting rid of the old. We think it's always worth a few minutes to find the best way to dispose or recycle unwanted stuff: noon to 5, Sunday, August 5, at Civic Center Park in Berkeley.