a href="http://www.nytimes.com/2011/01/28/sports/28xgames.html?partner=rssnytemc=rss"img src="http://graphics8.nytimes.com/images/2011/01/28/sports/XGAMES2/XGAMES2-thumbStandard.jpg" border="0" height="75" width="75" hspace="4" align="left"/aHalfpipe competitors at the X Games have been heartened to witness firsthand the recovery of Kevin Pearce, who sustained a brain injury during practice in 2009. More...