Can anyone tell me a word in the English dictionary which has a silent 'z'?

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?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

What does the below rebus puzzle mean?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

Identify Me

Hint1: I am a god
Hint 2: I am a planet
Hint 3: measurer of heat

Two men play a dice game involving roll of two standard dice. Man X says that a 12 will be rolled first. Man Y says that two consecutive 7s will be rolled first. The men keep rolling until one of them wins.

What is the probability that X will win ?

What is the fastest way to double your money?

Rearrange the letters in "new door" to make one word.