Witte Museum unveils first traveling exhibit of 2021 ‘The Machine Inside: Biomechanics’ Exhibit opens to public Saturday, runs until April 18 Updated: Tags: SAN ANTONIO – Ever wonder how the heart works as a hydraulic pump or how the levers in your body allow you to lift a book or dumbbell? A new experience is making its debut this weekend in San Antonio, allowing people of all ages to get lost in science. The Witte Museum is celebrating its first traveling exhibit of the new year and it takes a closer look at the nuts and bolts of the natural world. It’s called “The Machine Inside: Biomechanics” and it traveled from Chicago’s Field Museum.