Nanodiamond, or if you prefer to use the more accurate name aggregated diamond nanorod, is the answer.
This very question itself, my friend, is the hardest question in the world.
This question is the hardest question to answer.
Whats the only fruit to have its seeds on the outside? Stawberries
English is the hardest subject ever Rocket Science or a Quantum Physicist.
Only the most best answerer.
This very question itself, my friend, is the hardest question in the world.
This question!
Fineeeeeeeeee
What is the value of pi.
I assume you mean "whole world" rather than "hole world". There is no "hardest math question" because one's field of knowledge may be different to another. Therefore, the hardest question for one person may be an easy one for others.
More information is needed to properly answer this question. The top 10 hardest firms in the world is too broad. Do you mean the hardest firms to get hired by, the hardest firms to work for, the hardest firms to sue?
This question is the hardest question to answer.
Whats the Cure to all diseases?
the hardest maths sum is the question 6 of the 1988 maths olympiad
Your question is very vague. What do you mean by hard?
NO CHEATING DONT USE GOOGLE!!! 😡
the hardest i can think of is "What is the answer to this question?"