What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what 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?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

You need to remove two matchsticks to make the below equation true. Can you do it ?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

What jumps when it walks and sits when it stands?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

I’m tall when I’m young, and I’m short when I’m old. What am I?

Using eight eights and addition only, can you make 1000?