What is so fragile that saying its name breaks it?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

What is always in front of you but can’t be seen?

Solve below popular number sequence
314 159 265 358 979 323 846 ?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

John decided to give his bike 3 coats of paint. Which coat would go on the first?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?

Who is that with a neck and no head, two arms and no hands? What is it?

A pack of cards has 40 cards. You are blindfolded. Out of 40, 25 cards are facing down while 15 are facing up. You have been asked to divide this pack of cards into two decks - so that each deck contains an equal number of face-up cards. Remember, you are blindfolded.

How will you do it?