A man dies of old age on his 25 birthday. How is this possible?

On a special event at the prison, 5 prisoners John, Jacob, Krist, Tang, and Dang given a chance to go to a sauna and can bring one thing with them.

Following are the things that the prisoners bring with them.
John: A soda
Jacob: Thermos
Krist: Book named "How to kill"
Tang: A Walkman
Dang: Harmonica

Since it is a Sauna, no one can see each other. After a while When the steam is switched, Tang was found dead and there was blood all around.
J Bond was called and he instantly come to know who can be the murderer. How?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

What does the below rebus riddle means?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?