A hacker or an “angry” employee has overtaken the official NASA Jet Propulsion Laboratory’s Twitter account to re-tweet rants against US Republican presidential nominee Mitt Romney. “@NASAJPL Why are you re-tweeing anti-Romney Tweets?” a Twitter user wrote in response. Shortly after, the culprit started to delete the tweets, but at that point, Twitter was already buzzing because NASA was apparently getting very involved in politics. “Items retweeted this evening were not intended nor approved for this account. They do not in any way represent the views of NASAJPL,” NASA JPL representatives wrote after regaining the account. They haven’t revealed if...