In theory, there's insurance for everything (mostly in that there are some catch-all forms of insurance that can be applied extremely broadly). More concretely, insurance is for things that are either extremely expensive, prone to cause lawsuits, or both.
In some places, yes, you can just walk into a store and buy a gun, though with a few rare exceptions, no where is completely instantaneous (as far as I know). There DOES have to be a background check done (either right then or done ahead of time, re: license), and most often there's a waiting period, ranging anywhere from a few hours to a few days. Gun laws vary dramatically from state to state, county to county, even city to city (i.e. mine has age limits on certain types of guns and ammunition). And of course, there are loopholes and such (i.e. get someone else to buy a gun for you, buy the mostly-unregulated parts and put the gun together yourself, etc.)
Flossing = taking a waxed thread and running it between your teeth, to push out any tiny food detritus that could settle down between them and cause long-term damage. There is some debate about how often to do this (i.e. the 'ideal' is to do so every day, but for a lot of people that kind of regularity can cause gum damage in the long run). Some people do it every day, some people only do it once or twice in the week leading up to their visit to the dentist's office.
Re: I had a thought:
In some places, yes, you can just walk into a store and buy a gun, though with a few rare exceptions, no where is completely instantaneous (as far as I know). There DOES have to be a background check done (either right then or done ahead of time, re: license), and most often there's a waiting period, ranging anywhere from a few hours to a few days. Gun laws vary dramatically from state to state, county to county, even city to city (i.e. mine has age limits on certain types of guns and ammunition). And of course, there are loopholes and such (i.e. get someone else to buy a gun for you, buy the mostly-unregulated parts and put the gun together yourself, etc.)
Flossing = taking a waxed thread and running it between your teeth, to push out any tiny food detritus that could settle down between them and cause long-term damage. There is some debate about how often to do this (i.e. the 'ideal' is to do so every day, but for a lot of people that kind of regularity can cause gum damage in the long run). Some people do it every day, some people only do it once or twice in the week leading up to their visit to the dentist's office.