What goes up but never comes down?

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 part of Turkey has the most feathers?

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

What can you deduce from the following BrainBat?

CRY
LMKI

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?