Can you place six X (crosses) in below board without making three in a row in any way ?

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

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

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

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

A blonde put eyeliner on her head. Why?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

You need to arrange three 7 and mathematical symbols to form number 1?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?