Increasing the humidity or temperature of the air makes it less dense. With air molecules packed less densely, they travel further before bumping into their neighbors as a sound wave propagates through the gas. This results in faster transmission of sound.
Not if you're moving away from the source equidistant to the speed of the sound wave. HA!
See, science if corrupt .
The only reasonable argument for owning a gun is to protect yourself from the police.