If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

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?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

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?

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

What occurs twice in a week, once in a year but never in a day?