Count the number of balls in 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.

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Can you spot the hidden clock in this family photo? Only the most eagle-eyed will find it!

I know a nine-letter word having only one vowel.
Do you ?

What is the end of everything?

A few friends are enjoying their sea voyage in a boat full of apples. On the way, they felt hungry and thus decided to eat the apples. Together, they ate two dozen of apples. When they have eaten the apples, will there be any change in the water level?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

Can you place six X (crosses) in below board without making three in a row in any way ?