While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

Name a key which is hardest to turn.

You can see it everyday, But cannot touch it at will. What is it?

What brings you down but never up?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Can you identify the hidden rebus in the image below?

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?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?