Why is the sky blue? And other surprisingly difficult questions.

If you have ever encountered a magnet and thought about it for a few minutes you will have undoubtedly wondered how the damn things work. Why, when I bring my souvenir photo of Yosemite National Park, encased in plastic, near a fridge does it decide to stick? How does it know to move in that direction? What information is communicated by a seemingly inert piece of rock and metal…