The Cambridge Science Festival is nine days of making science accessible, interactive, and fun — in lectures, debates, exhibitions, concerts, plays, workshops, etc. — in a variety of locations in and around Cambridge.  Check out the full calendar of events.  Class field trips are welcome (group reservations may be required for some events).  These videos from last year provide a preview for 2011.

There’s a free science carnival, April 30, Noon-4PM, at the Cambridge Public Library:  Over 70 amazing exhibits, presentations, activities.