Good Riddles

Question: Whoever makes me can hear me, but nobody else can.

What am I?

Question: I grow from trees and your home,
once I am grown I fall to my doom.

What am I?

Question: What can float but can't sink.

Question: If you are smart and very good at math. Answer these 2 math riddles. 1. What is 0x29840847894657867478465875674896478496478567968. 2. 1x89498784893246798648732742974823.

Question: What can you smell but not see. And can be deadly, too.