I have eight fingers and two thumbs but I do not live. What Am I?

Why is Saturday stronger than Monday?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

How many triangles can you count in the figure given?

You need to remove two matchsticks to make the below equation true. Can you do it ?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

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?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?