Magnets and magnetic field demonstrated aboard the International Space Station:
Optics and the Human eye
The most important lenses in your world is the one in each of your eyes. How your eyes adapt to focusing on near and far objects is a practical example of refraction and lenses.
Momentum in Space
Momentum and conservation of momentum demonstrated on the International Space Station:
Simultaniety
Time is relative. From different frames of reference observers can experience what appears to be contrasting viewpoints: