What is the coolest letter in the alphabet?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Count the squares in the matchstick puzzle below?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What is red and smells like blue paint?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

A guy in his thirties is found dead in a forest. The shocking thing about the body is that he is wearing his swimming trunks snorkel and a facemask.

For your information, the nearest lake is some 10 miles away and the sea is hundreds of miles away.

How did he die then?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?