Medium Riddles

What is so delicate that saying its name breaks it?

What falls but never breaks, and breaks but never falls?

What has a bottom at the top?

I’m light as a feather, yet the strongest person can’t hold me for more than a few minutes. What am I?

Four brothers run around the world, but never meet each other. Who are they?

What weighs more: a pound of feathers or a pound of gold?

Forward I am heavy, but backward I am not. What am I?

What kind of coat can only be put on when wet?

What can fill a room but takes up no space?

What is always coming but never arrives?