Answer:
What goes through a door but never goes in. And never comes out?
It's been around for millions of years, but is never more than a month old. What is it?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Three lives have I. Gentle enough to soothe the skin. Light enough to caress the sky. Hard enough to crack rocks.
Who spends the day at the window, goes to the table for meals. And hides at night?
How do you know if a sniper likes you?