What is more useful when it is broken?

Which five letter word can be added at the end of below word to form a
valid word?

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My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Can you find out the missing number in the grid?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

If 1+9+8=1, what is 2+8+9?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

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

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?