Reuters - Workers at a Google data center combined 12 century know how and space age technology to trigger a medieval weapon that was used to hurl rocks, balls of fire and dead animals over castle walls.<p><strong>Read more:</strong> <a class="rssreadon" rel="external" title="High tech gadgets used to trigger medieval weapon   (Reuters)" href="http://us.rd.yahoo.com/dailynews/rss/oddlyenough/*http%3A//news.yahoo.com/s/nm/20110301/od_nm/us_competition_trebuchet_odd" target="_blank">http://us.rd.yahoo.com/dailynews/rss/oddlyenough/*http%3A//news.yahoo.com/s/nm/20110301/od_nm/us_competition_trebuchet_odd</a></p>