BOSTON CHILDREN’S MUSEUM Hands-on exhibits engage children in the world around them, from environmental issues to a construction site. Through January, visit Building Brainstorm in the Global Gallery, featuring exhibits about architecture and design. 308 Congress St., Boston. Sat-Thu 10 a.m.-5 p.m., Fri 10 a.m.-9 p.m. Free-$12. 617-426-6500, www.bostonchildrensmuseum.org