What is so fragile that saying its name breaks it?

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Optical Illusion Eye Test: You Have A Brain Like Computers If You Can Spot Two B's Among R's In 8 Seconds!

I have teeth but i don't bite. Who Am I ?

Can you count the number of squares in the given picture?

Replace the question mark with the correct number in the below-given picture?

How can one talk without saying a single word?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.