The Sega video game character Sonic the Hedgehog is celebrating his 20th birthday.pThis article is from the a href="http://news.bbc.co.uk" title="Link to BBC News"BBC News website/a. © British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites./p pa href="http://feedads.g.doubleclick.net/~a/g5afwOvKJlI1h5URUpC0pA4pHPU/0/da"img src="http://feedads.g.doubleclick.net/~a/g5afwOvKJlI1h5URUpC0pA4pHPU/0/di" border="0" ismap="true"/img/abr/ a href="http://feedads.g.doubleclick.net/~a/g5afwOvKJlI1h5URUpC0pA4pHPU/1/da"img src="http://feedads.g.doubleclick.net/~a/g5afwOvKJlI1h5URUpC0pA4pHPU/1/di" border="0" ismap="true"/img/a/pimg src="http://feeds.feedburner.com/~r/BbcNewsTechnologyFullFeed/~4/qFGm2x4edu4" height="1" width="1"/