How do historians know that metalworkers in the Gupta Empire made great progress in metallurgy?

If you heat soup on a stove, what happens to the movement of the soup's particles? a. the particles move slower. b. the particles move faster. c. there's no change in the speed of particles. d. the particles stop moving.

Gettysburg address question. lincoln uses the images of birth and rebirth in this address. why?

What extraordinary role does learning think we can play in the universe?