As you consider what you're doing for Earth Day (it's tomorrow, by the way), add this to the list: The Museum of Science and Industry is offering free admission all day (9:30 a.m.-4 p.m.).
While you're there, make sure to check out the recently re-opened exhibit, "Smart Home: Green + Wired." Not only will you be able to tour the "Greenest Home in Chicago," but you'll see 40 students from Hyde Park's Bret Harte Elementary School helping to plant a sustainable garden for the home (they'll be there from 10 a.m.-noon). If that doesn't get you in the Earth Day spirit, nothing will. If you get inspired, we've found a list of ways you can do your part throughout the week.