What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

Find out the missing number in the picture attached:

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

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 am an odd number. Take away a letter and I become even. What number am I?

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

When does a USA Potato change its nationality?

Rebus Puzzle Definition: A rebus is an illusion device that uses pictures to represent words or parts of words.
What does This Rebus Puzzle Identify?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

Do You See It?