Why is the sky blue?

You ask: Why sky blue?

Sun throw light at sky. Light look white, but many colors hide inside, like berries mixed in stew. Air made of tiny tiny bits. Tiny bits grab blue light and throw it every direction — blue bounce all over sky. Red and yellow light ride longer waves, too big to bounce much, they go straight. So when Caveman look up, blue come at Caveman from everywhere. At sunset, light travel through much more air, blue all bounced away before reaching eye — only red and orange left. Cave wisdom: sky not blue thing. Sky full of bouncing blue light.