Out of which vegetable were jack o’ lanterns originally made?

Why do all market economies have taxes to support armed forces police forces public schools and at least some form of public transportation?

How has our understanding of the first sentence of the declaration of independence changed over time?

Before they can be published, scientific papers must be peer-reviewed. this means that: a) some other scientific experts read the papers and guarantee that they are true.b) some other scientific experts read the papers and provide quality control by eliminating many mistakes.c) an editor reads the papers, to make sure that all the semicolons are in the correct places.d) everyone in the world is given the opportunity to comment on the papers through a specially maintainedblog.e) government bureaucrats read the papers, to be sure that the papers do not insult the political positions ofthe current officeholders.