What is the coolest letter in the alphabet?

It was a dark stormy night and a couple were in a car driving madly to a city. The car broke down and the husband had to go get help from someone who spoke his language. He was afraid to leave his wife alone in the car so he locked the car before leaving. When he came back, the car was in the same state as he had left it but his wife was dead, there was blood on the floor and there was a stranger in the car. What happened?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

Solve the following series:
AZ, GT, MN, __, YB

Can you fill the blank with the correct number?

6 30 870 756030 _____

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99