The first day of class is always fun. I try to review two things:
1.) Cell Biology: Zoom in and out through the cell. How big are different biomolecules?
2.) Instrumentation: How to separate and analyze the parts of the cell with everyday items that could be used globally -- e.g., in Burundi. In the past few years this has expanded exponentially thanks to portable phones and 3D printing.
If I had a theme park, the first point would make a really great dark ride and the second would make for some EPCOT-like interactive exhibits.
Here's so you can listen in if you like (sorry for the loud scratchy mic at the beginning when I have to quiet them all down!):