John is the son of Jacob.
So,
Jacob is the_____of John's father?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

Can you tell a 3D object that has just two surfaces?

What type of tree can I carry in my hand?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Find the missing letter in the last circle logically in the given below picture.

How many triangles can you find in this given picture?

How can you make a TV, a bed, a dog, and a car liquid?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?