I went to the science museum (don't know what is it called exactly) in Barcelona and there they have demonstrations of many laws of physics, such as if you are spinning and extend your hands, you will slow down and vice versa.

There were descriptions for each of the demonstration and yet I saw parents with kids who just went from one to the next, didn't bother to understand or read about the demonstration and in general were completely useless in teaching their kids.

It was awful.