Question

Which material is the best heat insulator?
-wood
-glass
-metal
-plastic

Answer 1

Leaning more towards wood, because of its capacity for combustion but it does not really "insulate"

Answer 2

Glass. Definitely glass.

Answer 3

Could look up "thermal conductivity" and choose the one with lowest value.

Answer 4

I'm going with wood over all the others only because they don't state the kind of wood or plastic. Here is what helped me decide http://en.wikipedia.org/wiki/List_of_thermal_conductivities.