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In honor of Earth Day, the Shedd Aquarium (1200 S. Lake Shore Drive) is planning to hand out free tickets from an "undisclosed location" on Wednesday. Jump on their Twitter feed before then to get marching orders. For those hesitant about wading into the raging river of information that is Twitter, the Shedd is also offering freebies with general admission this week. The first 100 families to visit the aquarium each day will get a free reusable grocery bag, and on Saturday and Sunday, experts will give sessions on green gardening techniques from 10 AM to 4 PM.