var tfd_html_article='<table class=ArticleOfTheDay id=ArticleOfTheDay><tr><td align=left><map name=tfd_icon_article><area shape=rect coords="0,0,11,11" target=_blank href="http://www.google.com/ig/add?moduleurl=http%3A//www.thefreedictionary.com/_/WoD/article-module.xml" title="Add to Google"><area shape=rect coords="13,0,22,11" target=_blank href="http://e.my.yahoo.com/config/cstore?.opt=content&.url=http%3A//www.thefreedictionary.com/_/WoD/rss.aspx?type=article&.page=p1" title="Add to My Yahoo!"><area shape=rect coords="23,0,34,11" target=_blank href="http://www.thefreedictionary.com/_/WoD/rss.aspx?type=article" title="RSS feed source"></map><img usemap="#tfd_icon_article" style="width:34px;height:11px;float:right;border:none" src=http://img.tfd.com/m/g-y-rss.gif><a target=_top href="http://encyclopedia.thefreedictionary.com/Tracer+ammunition"><img style="margin-right:3px;float:left" border=0 src="http://img.tfd.com/IOD/M60closeup2002.jpg" width=100 height=65></a><H3 style="margin-bottom:3pt">Tracer Ammunition</H3><SPAN>Used in machine guns since WWI, tracer ammunition contains modified bullets packed with a pyrotechnic charge that ignites upon firing, illuminating the bullets. This technology enables a shooter to check a bullet\'s trajectory and adjust his or her aim accordingly. Since the tracer path can also betray a shooter\'s position, many modern tracers are designed to become visible only once they have traveled a set distance. What optical illusion do people being fired upon by tracers often experience?</SPAN> <a target="_top" href="http://encyclopedia.thefreedictionary.com/Tracer+ammunition"><b>More...</b></a></td></tr></table>';
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