What is the coolest letter in the alphabet?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Look at me. I can bring a smile to your face, A tear to your eye, Or even a thought to your mind. But, I can't be seen. What am I?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

Name a key which is hardest to turn.

What does an Island and the letter T have in common?

What can go up a chimney down, but can’t go down a chimney up?

Consider this about a word: The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

Do you know who was buried in John's tomb?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.