I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?

In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

What is wrong in the below Picture?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Find the smallest sentence with all the English alphabet.

Why do people go to bed?

What number should come in place of the question mark below?

A man dies of old age on his 25 birthday. How is this possible?

What can go through glass without breaking it?