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

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

Which is heavier: a ton of bricks or a ton of feathers?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Can it be possible to build a house that has all its four walls facing towards the South?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

I have teeth but i don't bite. Who Am I ?