New riddles

On the first day of the school a young girl was found murdered. Police suspect four male teachers and question them. They were asked what they were doing at 8:00 am. Mr. Walter: I was driving to school and I was late. Mr. Thomas: I was checking English exam papers. Mr. Benjamin: I was reading the newspaper. Mr. Calvin: I was with my wife in my office. The police arrested the killer. How did the police find the murderer?

If you have one pound of rocks and one pound of feathers, which one will weigh more?

If a boy is 12 and his brother is 13, how is the 12 year old older than his brother?

What can be swallowed, but can also swallow you?

What always ends everything?

The thunder comes before the lightning; the lightning comes before the clouds. The rain dries everything it touches. What am I?

The day before two days after the day before tomorrow is Saturday. What day is it today?

It regulates our daily movements, but it feels no interest in our lives. It directs us when to come and go, but does not care if we pay attention. What is it?

Tall I am young, short I am old. While with life I glow, wind is my foe. What am I?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?