[charlysisto]

I was generally not bad at physics but I remember not getting my head around this one...

What a great lesson for decoupling systems. I wonder what's the software equivalent in design pattern land. The facade maybe ?

[noblethrasher]

Not sure about a corresponding design pattern, but the content neatly maps (no pun intended) to function composition.

[tapatio]

I never really got my head around electricity and magnetism. That stuff is very abstract.