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: Cracked rock points to more martian water A cracked rock called Escher is helping NASA scientists reconstruct the history of water on Mars. They say that the crater currently being explored by the Opportunity rover may have been shaped by a second 

Sci/Tech