From Sat-Thu 1/16-1/21, and on the remaining Mondays and Tuesdays of January, the Shedd Aquarium (1200 S. Lakeshore) is offering free general admission to its original galleries and $8 discounts on all-access passes for the Oceanarium and Polar Play Zone, Wild Reef, Amazon Rising, Caribbean Reef, Waters of the World, and Fantasea (Shedd’s new aquatic show).