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

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Can you solve below mathematical equation?

2^1234 - 2^1233

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

How can you make number one disappear by adding something to it?

In which direction should the missing arrow point?

A swan sits at the center of a perfectly circular lake. At an edge of the lake stands a ravenous monster waiting to devour the swan. The monster can not enter the water, but it will run around the circumference of the lake to try to catch the swan as soon as it reaches the shore. The monster moves at 4 times the speed of the swan, and it will always move in the direction along the shore that brings it closer to the swan the quickest. Both the swan and the the monster can change directions in an instant.
The swan knows that if it can reach the lake's shore without the monster right on top of it, it can instantly escape into the surrounding forest.

How can the swan successfully escape?

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

What does below chemistry rebus means?