"We still don't know how ordinary window glass works and keeps it shape."

DNA Nebula

Seven questions that keep physicists up at night.  Among them:

Why this universe?

What is everything made of?

How does complexity happen?

What is reality really?

"We still don't know how ordinary window glass works and keeps it shape,"  said Professor Leo Kandanoff from the University of Chicago, one of the physicists interviewed.

Is it a liquid,  a solid or some "distinctly different structure with properties of both liquids and solids?