What happened when the wheel was invented?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

I look at you, you look at me, I raise my right, you raise your left. What am I?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?

Can you write down eight eights so that they add up to one thousand?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

I cannot talk, but I always reply when spoken to. What am I?