The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

In the following series, a set of numbers is progressing with a particular pattern. Can you deduce that pattern and find the missing set?

(2 + 6), (21 + 6), (58 + 6), (119 + 6), ___

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Can you find out which options fits best with the missing column?