Hard.

Question: You were asked to label the light switches for your company. You are in a room, with unlabeled light switches. There are 3 of them, and there are 3 lightbulbs in the next room. You can not travel back and forth. How do you successfully label the lightbulbs???

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?

Question: During what month do people sleep the least?

Question: When is 99 more than 100?

Question: What can be broken but never forgotten?

Question: Surrounded by life , yet life is its biggest enemy. But without life there is no need for it to exist. What is it?