A father's child, a mother's child, yet no one's son.

Who am I?

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?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

What part of the chicken has the most feathers?

Look at me. I can bring a smile to your face, A tear to your eye, Or even a thought to your mind. But, I can't be seen. What am I?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

Can you count the number of blocks in the picture below?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

I have Rs.50 and I spend it in the way as below.