Answer:
When you put this in a heavy wooden box the box will become lighter
A claustrophobic person gets on a train. The train enters a tunnel just as it is leaving the station. Where is the best place for him to sit?
How is it possible to always find what your looking for in the last place you look?
The yellow house has yellow window, the red house has red windows, what colour windows does the green house have?
You can see me when two prisons throw light from one side and other side but odd number?
I stand in one place yet fill the whole room. I can be filled with molten rock and come in every hue. What am I?