What can always be measured but never can be seen? Check the answer here.
A man takes a barrel that weighs 20 pounds and then puts something in it. It now weighs less than 20 pounds. What did he put in the barrel?
Why can’t a nose be 12 inches long?
What costs more than riches but doesn’t cost a penny; that’s also hard to find yet easy to lose? Check the answer here.
What gets wetter as it dries? Check the answer here.