Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: No Regrets, Says Departing NASA Boss CAPE CANAVERAL, Fla. - NASA #39;s departing boss, Sean O #39;Keefe, said Friday he does not regret canceling the last shuttle mission to the Hubble Space Telescope - or anything else during his three years on the job.

Sci/Tech