No one wants to have it, but if one got it, he does not want to lose it. What is It?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

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!!!

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

What am I?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

Two prisoners Jack and Jill are locked in a cell.
There is open window approx 40 feet above the ground of the cell.
They are never able to reach there.

Then they plan to escape by a tunnel and they start digging out.
After digging for more than 20 days, Jill comes with the different plan and they escaped.

what was the plan ?

Buy me, smell me or deliver me, I do not change.

Who am I?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?