What is both possible and impossible at the same time?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

A landlord calls both of his sons and tells them that their horses will now decide who will transfer the inheritance. He tells them to race along the land till the end and the one whose horse will be slower will win and be the heir to all the property.

Both of them keep wandering for days but to no result. Then they ask a wise man regarding it. The man advises them on the matter after which they jump on the horses and race as fast as they can till the end. Why did they do it?

What did the wise man say?

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

Using exactly three matchsticks, can you divide the area into two equal parts?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Can you Find and name the hidden bird in the picture below ?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.