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

I can turn polar bears white.
I can make anyone dance.
I can make everyone cry
I can make your hands clap
I can make you thin.
I can make you smile.
I can make you smile

Can you guess the riddle?

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?

John can eat 27 chocolates in an hour, Jacob can eat 2 chocolates in 10 minutes, and Jolly can eat 7 chocolates in 20 minutes. How long will it take them to share and eat a box of 120 chocolates whilst playing Chess?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

When 99 is considered higher than 100?

10+10 and 11+11 can give you the same answer.

Explain how?

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

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

How can a man go eight days without sleep?