interesting facts!

do you know:
~starfish have no brain!
~it's impossible to sneeze with your eyes open!
~guinea pigs donnot have tails!
~marie curie is a scientist who discovered radioactive elements radium and polonium.she was the first person to win 2 noble prizes!
~skin is the largest organ in the human body!
~humming brds can fly backwards!
~there are more thn 100kinds of arthrites!
~brass is an alloy of copper and zinc!
tht's it!