Why is a river so rich ?

Different lights make me strange by changing me into different sizes. What am I?

Can you make a six-letter word using the letters N, A and B ?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

Can you name four days which start with the letter 'T'?

What is Luis Suarez's (Soccer Player) favorite tea?

What can you serve, but never eat?

How can you make a TV, a bed, a dog, and a car liquid?