Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

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

What number should come in place of the question mark below?

The more it dries, the wetter it becomes. Can you tell what it is?

Can you identify the famous TV character from the rebus below?

What has many keys but can’t open a single lock?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

How can you leave a room with two legs and return with six legs?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?