It is shower.
Everyone knows that both Christmas Day and New year's Day always fall on the same day of the week. However, in 1939 the year of the outbreak of World War II, Christmas fell on a Monday and New Year's fell on a Sunday. Why?
I hold up the sky; I hold many pounds. Just so you know, I can never fall on the *ground*. I am made of the world; without me you'll die. The ones who survive are the ones that can fly. What am I?