"Tons of interactive exhibits" – a 2004 expansion added three floors of "engaging" displays – bring out the Einstein in everyone at this "refreshing" science museum across the harbor from the National Aquarium; good for "an enjoyable afternoon", it boasts an "awesome IMAX" that's "fun for all ages", shows at the Davis Planetarium and a rooftop observatory that offers after-hours stargazing every Friday night; N.B. closed Mondays in winter.