Janus Worldwide and Janus Overseas are a pair of funds that, as Morningstar analyst Kai Wiecking observes, once moved in unison. Now the two funds couldn't be more different, and it's rather interesting to see how they've evolved through the bull market of the late 1990s, the tech crash and the ensuring bear market to where they are today.

Worldwide once stood as Janus' flagship global product. Overseas, meanwhile, was purely international but equally successful. Former Janus whiz Helen Young Hayes guided both funds with the aggressive, momentum-driven growth style the Denver shop was know for and, investors responded by throwing billions of dollars her way.

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