The saying "What goes up must come down" is an appropriate starting point. If you fire a gun into the air, the bullet will travel up to a mile high (depending on the angle of the shot and the power of the gun). Once it reaches its apogee, the bullet will fall. Air resistance limits its speed, but bullets are designed to be fairly aerodynamic, so the speed is still quite lethal if the bullet happens to hit someone. In rural areas, the chance of hitting someone is remote because the number of people is low. In crowded cities, however, the probability rises dramatically, and people get killed quite often by stray bullets. Most major cities have laws in place to try to keep people from shooting guns into the air in celebration.
For the battlefield of the future, the U.S. Army is developing an infantry uniform that will provide superhuman strength and much more. Learn how the Future Force Warrior will turn a soldier into an "F-16 on legs."
How in the world can a gun silencer work? How can you possibly take an explosive noise that can damage your hearing and turn it into a little "ffft" sound?