like has been said, you need to compare apples to apples when it comes to coding.
look at the feed directly in the browser, without a reader, i.e. put the whatever.rss url in the browser url bar. depending on browser it might look a bit different, as most browsers try to apply some basic styling..but importantly all the feed items will be in the page just as your code would download the feed and do things to it.
rss reader applications, some of which are like google reader and some (especially older ones) are standalone GUI applications. these reader applications do a whole lot more stuff behind the scenes, and hence don't just present the feed as you would get it with a single GET request in code.
the hardest line to type correctly is: stty erase ^H

In reply to Re^2: How to retrieve all RSS data by aquarium
in thread How to retrieve all RSS data by show

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