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?

Before Mount Everest was discovered, what was the highest mountain in the world?

A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

You can see it everyday, But cannot touch it at will. What is it?

Can you find the hidden animal in the picture below?

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

Replace the letters of words with a number so that the below equation holds true

BASE +
BALL
---------
GAMES
----------

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Buy me, smell me or deliver me, I do not change.

Who am I?