2, 3, 5, 9, 17, _ What is the next number in the sequence?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

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 does the below rebus mean?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

There are two guys standing face to face in a room. On a wall, there is a clock. One of those is a prophet. He tells the other guy that he will be stabbed in the back in five minutes.

Shocked to hear that, the other guy stares at the clock. Just after the five minutes, he is stabbed on the back. Can you tell what happened?

What work can one never finish?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

No one wants to have it, but if one got it, he does not want to lose it. What is It?