Good Riddles

Question: What can you feel but never touch, hear but never see?

Question: Mike has a father named BOB. Bob is the......... of mike's fatfer

Question: There are three books on a shelf standing side by side. Each book is 10ml thick. The bookworm eats its way through the first page of the first book to the last page of the last book. How far did the bookworm move if it can only move in a straight horizontal line?

Question: There is this man how lives in a hotel , in sunny days he goes up the stairs to his hotel room and on rainy days he uses the elevator why?

Question: He Knows Everything!! But No one Knows him!!!