The senseo coffee maker is a machine that makes one cup of coffee at a time from specially prepared 'pods' of coffee. you can get the coffee maker at a very reasonable price. however, you can only get refill pods from the manufacturer and they tend to be expensive. this is an example of ?

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.