Logic Riddles

Question: On 20 planes I may be, but only rest on one you see. I can help you or hurt you, depending on where I lay. Because I am not the kind you use everyday

Question: When I was 2 years old, my brother was half my age. Now I am 100 years old, how old is my brother?

Question: There once was a green room, what was in it

Question: a mans car gets stolen but all the windows are up and the doors are locked there is no holes or breaks in the car how does it get stolen?

Question: Nary a tick, nary a tock- silent, silent, the handless clock. Tarry no longer; cast off all doubt. The sands of time are running out.