There's no real way to know, because many people have defended themselves with a gun but didn't have to shoot anyone, so no report was filed, and in some cases, the person never called the police. In the U.S. according to one source, it's 2.5 million each year, but that statistic is based on a "survey" so there's no way to really know exactly how accurate it is.
using the AK47
A crime committed under threat or menace can sometimes be defended using the duress defense. Duress is sometimes called coercion.
he did more research on penicillin & treated people successfully using it.
by showing people successfully surviving an atom bomb attack while on a picnic
Many people seem to use these sites successfully in our modern age.
Example sentence - He was a stranger to her when he needlessly defended his horrid daughters.
Some people can hurt them seleves using a computer is by Hurting there Eyes and the can go blind and die.
Their collective rights would be defended at all costs.
Conveniently let people know where they are
transferable skills used successfully on a job can show an emplyer the applicant can successfully preform a different job using the same skills
So people weren't using hundreds of different systems made by themselves
In space, they don't. If they are in a space shuttle, however, they would move themselves using handlebars attached to the shuttle designed specifically for propelling themselves.