What is the word or phrase below?
R | E | A | D

Our product and our sum always give the same answer. Who are we?

How can a man go eight days without sleep?

Complete the table series riddle by finding the number that can replace "??".

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

What is the riddle which can be asked all day with a different correct answer each time.

What do you answer even though it never asks you questions?

Count the number of triangles in the picture below:

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.

Can you name an animal whose killing cannot be performed without spilling your own blood?