Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

A man has to get a fox, a chicken, and a sack of corn across a river.

He has a rowboat, and it can only carry him and one other thing.
If the fox and the chicken are left together, the fox will eat the chicken.
If the chicken and the corn are left together, the chicken will eat the corn.

How does the man do it?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

I have branches, but no fruit, trunk or leaves. What am I?

The peacock is a bird that does not lay eggs. How do they get baby peacocks?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

What happened when the wheel was invented?