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?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

If a wheel has 54 spokes, how many spaces are there between the spokes?

In the image below, can you find the value of an angle(y)

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

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

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

Replace the question mark with the number below given a simple math problem.

What is the end of everything?