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The Museum of Science - This spring the MOS is hosting a "lets talk about food" free lecture series. The next event is Lets Talk About Sustainable Seafood on 4/29/12. There are also other lectures coming up, like The Hunt for Asteroids and Inspiring Minds: Meet Women in Science
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The Peabody Museum at Harvard University - This wonderful museum is constantly holding events that are either free or relatively cheap. Sustainable policy enthusiasts will love the Trash Talk Lecture Series, and families will love the drop-in all ages events.
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Mass Audubon Society - With locations throughout the state, Mass Audubon is a great way to fulfill your desire to learn in the suburbs. Many of the society's lectures are both free and take place outdoors. Take bird walks, go biking, or learn about wildlife in far off lands.