A boy is walking down the road with 3 people in his family. One of them is a doctor. While the boy is the doctor’s son, the doctor is not the boy’s father. Then who is the doctor?

What has a head and a tail but no body?

What gets bigger when more is taken away?

What building has the most stories?

What kind of dog never bites?

What tree do we all carry in our hands?

What can travel all around the world without leaving its corner?

What has many keys but can’t open a single door?

It's black, but you say it's clean. It's white, but you say it's dirty. What is it?

I have keys without key locks. I have space without rooms. You can enter but you cannot go outside.

What is the smallest room in the world? (hint: word that ends with "room")

How many months have 28 days?

What goes up when the rain comes down?