Looking for something to do in Chicago?
Let me recommend Body Worlds at the Museum of Science and Industry.
It is an anatomical exhibit of actual human bodies. I had the chance to take it in earlier this year, and I will say, I was blown away. Our bodies are absolutely fascinating devices, and this exhibition reminds us of it. Different body systems are isolated in separate bodies, and you learn about the way your body functions. The overwhelming sense of gratefulness to be alive I felt was hard to describe.
I will warn you, however, if you have a tendency to be squeamish, this may not be for you.