When sweden is playing denmark, it is swe-den. the remaining letters, not used, is den-mark

What are similarities and differences between refraction, reflection, diffraction and absorption?

You win the lottery and decide to impress your friends by exhibiting a million-dollar cube of gold. at the time, gold is selling for $ 426.60 per troy ounce, and 1.0000 troy ounce equals 31.1035 g. -how tall would your million-dollar cube be? en cm

What kind of simple machine is a catapult?