Understanding how electrons move or not through a solid material and so make a material a metal, an insulator or a semiconductor, for example, requires the development of "effective field theories" that don't go into all the details.

But it is difficult to constru...

“All at once it occurred to me—why paint? Why should I limit myself to two dimensions when I could make out from anything at all: fire, water, the human body? Anything! There was something like a click in my mind—I realized that being an artist meant having immense freedom.”

We nee...

This is a programming concept. “It means that each request is treated a new, without memory of previous requests.” It's the concept about the power of clarity. How we can focus on the task at hand, while not getting weighed down by all the junk we allow to pull at our attention.