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?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?

Can you spot the man between the coffee bean in the picture below ?

What kind of tree can you carry in your hand?

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

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?