The Shedd Aquarium is celebrating its 75th anniversary this year, and as part of the celebration it's offering free general admission to the aquarium, and reduced admission to its Wild Reef and Oceanarium exhibits. According to the Tribune, one of the newer exhibits is "Seahorses and Seadragons," which features some animals from the aquarium's wildly popular "Seahorse Symphony" exhibit, which ended last year. Better hurry to take advantage of the free admission; the offer is good only through this Thursday.