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	<title>Comments on: How do they make the first down line appear on the football field during a game?</title>
	<atom:link href="http://www.scienceline.org/2008/01/14/ask-tweed-yellowline/feed/" rel="self" type="application/rss+xml" />
	<link>http://www.scienceline.org/2008/01/14/ask-tweed-yellowline/</link>
	<description>The Shortest Distance Between You and Science</description>
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		<title>By: Steve</title>
		<link>http://www.scienceline.org/2008/01/14/ask-tweed-yellowline/comment-page-1/#comment-4462</link>
		<dc:creator>Steve</dc:creator>
		<pubDate>Mon, 08 Feb 2010 07:49:10 +0000</pubDate>
		<guid isPermaLink="false">http://scienceline.org/2008/01/14/ask-tweed-yellowline/#comment-4462</guid>
		<description>I&#039;ve been curious of this for a while also.  Thanks for your post and excellent explanation. It&#039;s definitely more complicated than I thought though!</description>
		<content:encoded><![CDATA[<p>I&#8217;ve been curious of this for a while also.  Thanks for your post and excellent explanation. It&#8217;s definitely more complicated than I thought though!</p>
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		<title>By: Sandy</title>
		<link>http://www.scienceline.org/2008/01/14/ask-tweed-yellowline/comment-page-1/#comment-4460</link>
		<dc:creator>Sandy</dc:creator>
		<pubDate>Mon, 08 Feb 2010 00:41:39 +0000</pubDate>
		<guid isPermaLink="false">http://scienceline.org/2008/01/14/ask-tweed-yellowline/#comment-4460</guid>
		<description>Thanks!  I&#039;ve wondered about this for a long time.  The guys I&#039;ve asked just take it for granted, but I wanted to know how they did that. Now I know my answer.</description>
		<content:encoded><![CDATA[<p>Thanks!  I&#8217;ve wondered about this for a long time.  The guys I&#8217;ve asked just take it for granted, but I wanted to know how they did that. Now I know my answer.</p>
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		<title>By: nfl rumors</title>
		<link>http://www.scienceline.org/2008/01/14/ask-tweed-yellowline/comment-page-1/#comment-4265</link>
		<dc:creator>nfl rumors</dc:creator>
		<pubDate>Fri, 25 Dec 2009 04:24:08 +0000</pubDate>
		<guid isPermaLink="false">http://scienceline.org/2008/01/14/ask-tweed-yellowline/#comment-4265</guid>
		<description>Yo what was he thinking, that&#039;s nuts</description>
		<content:encoded><![CDATA[<p>Yo what was he thinking, that&#8217;s nuts</p>
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		<title>By: lena</title>
		<link>http://www.scienceline.org/2008/01/14/ask-tweed-yellowline/comment-page-1/#comment-3373</link>
		<dc:creator>lena</dc:creator>
		<pubDate>Sun, 13 Sep 2009 15:14:52 +0000</pubDate>
		<guid isPermaLink="false">http://scienceline.org/2008/01/14/ask-tweed-yellowline/#comment-3373</guid>
		<description>it&#039;s eye black, it reduces the glare/reflection from the sunlight or bright stadium lights so the player can focus on the ball or players.

foot ball isn&#039;t the only sport that uses it, several othe sports use it, but it&#039;s also widely used in Major League Baseball

some players have now gone as far as putting short phrases on them as well which is really somethin that I don&#039;t see the need for, because it seems like it&#039;s defeating the purpose.</description>
		<content:encoded><![CDATA[<p>it&#8217;s eye black, it reduces the glare/reflection from the sunlight or bright stadium lights so the player can focus on the ball or players.</p>
<p>foot ball isn&#8217;t the only sport that uses it, several othe sports use it, but it&#8217;s also widely used in Major League Baseball</p>
<p>some players have now gone as far as putting short phrases on them as well which is really somethin that I don&#8217;t see the need for, because it seems like it&#8217;s defeating the purpose.</p>
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		<title>By: Michelle</title>
		<link>http://www.scienceline.org/2008/01/14/ask-tweed-yellowline/comment-page-1/#comment-2624</link>
		<dc:creator>Michelle</dc:creator>
		<pubDate>Sun, 11 Jan 2009 02:06:31 +0000</pubDate>
		<guid isPermaLink="false">http://scienceline.org/2008/01/14/ask-tweed-yellowline/#comment-2624</guid>
		<description>George - 
no, but there are the big orange bulls-eye things being held by people on the sides that show the players where the first down is.  Technically, they are called &quot;markers&quot;.  Look at the yellow line and follow it to the sides, you can usually catch a peek of the marker and holder-guy!
The point is to reach for the 1st down line, so I would assume that is why they seem to be reaching for it. Because they are.
:)
Happy Playoffs!
Go Arizona, Go New York!</description>
		<content:encoded><![CDATA[<p>George &#8211;<br />
no, but there are the big orange bulls-eye things being held by people on the sides that show the players where the first down is.  Technically, they are called &#8220;markers&#8221;.  Look at the yellow line and follow it to the sides, you can usually catch a peek of the marker and holder-guy!<br />
The point is to reach for the 1st down line, so I would assume that is why they seem to be reaching for it. Because they are.<br />
:)<br />
Happy Playoffs!<br />
Go Arizona, Go New York!</p>
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		<title>By: george</title>
		<link>http://www.scienceline.org/2008/01/14/ask-tweed-yellowline/comment-page-1/#comment-2622</link>
		<dc:creator>george</dc:creator>
		<pubDate>Sat, 10 Jan 2009 20:45:58 +0000</pubDate>
		<guid isPermaLink="false">http://scienceline.org/2008/01/14/ask-tweed-yellowline/#comment-2622</guid>
		<description>does the player know where the yellow line is?

It looks like they are reaching for it.</description>
		<content:encoded><![CDATA[<p>does the player know where the yellow line is?</p>
<p>It looks like they are reaching for it.</p>
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		<title>By: erin</title>
		<link>http://www.scienceline.org/2008/01/14/ask-tweed-yellowline/comment-page-1/#comment-2603</link>
		<dc:creator>erin</dc:creator>
		<pubDate>Sun, 04 Jan 2009 04:34:14 +0000</pubDate>
		<guid isPermaLink="false">http://scienceline.org/2008/01/14/ask-tweed-yellowline/#comment-2603</guid>
		<description>i work with layers in film and i could not figure out how they chroma keyed the whole field, that 3d information just blew my mind!

awesome!!!</description>
		<content:encoded><![CDATA[<p>i work with layers in film and i could not figure out how they chroma keyed the whole field, that 3d information just blew my mind!</p>
<p>awesome!!!</p>
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		<title>By: Jan</title>
		<link>http://www.scienceline.org/2008/01/14/ask-tweed-yellowline/comment-page-1/#comment-2353</link>
		<dc:creator>Jan</dc:creator>
		<pubDate>Sat, 01 Nov 2008 17:47:38 +0000</pubDate>
		<guid isPermaLink="false">http://scienceline.org/2008/01/14/ask-tweed-yellowline/#comment-2353</guid>
		<description>THANK YOU!!!  How this was done has been bugging me for two years, since I started dating again.  Even the guys who are &quot;real&quot; football fans couldn&#039;t tell me how the graphics were projected on the screen.  Of course, they really only care about which team has the ball.  But, they have simple minds that are easily entertained...witness the popularity of wrestling!  (Can you explain that??)

Thanks again.</description>
		<content:encoded><![CDATA[<p>THANK YOU!!!  How this was done has been bugging me for two years, since I started dating again.  Even the guys who are &#8220;real&#8221; football fans couldn&#8217;t tell me how the graphics were projected on the screen.  Of course, they really only care about which team has the ball.  But, they have simple minds that are easily entertained&#8230;witness the popularity of wrestling!  (Can you explain that??)</p>
<p>Thanks again.</p>
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		<title>By: kenneth gallant</title>
		<link>http://www.scienceline.org/2008/01/14/ask-tweed-yellowline/comment-page-1/#comment-2301</link>
		<dc:creator>kenneth gallant</dc:creator>
		<pubDate>Tue, 21 Oct 2008 20:44:51 +0000</pubDate>
		<guid isPermaLink="false">http://scienceline.org/2008/01/14/ask-tweed-yellowline/#comment-2301</guid>
		<description>Wonderfully explained and timely--I&#039;ve been hunting feverishly to get this answer for my nephews.  Now I want to know how and if Eye Black under athletes eyes works--I&#039;ll keep at it.

thanks</description>
		<content:encoded><![CDATA[<p>Wonderfully explained and timely&#8211;I&#8217;ve been hunting feverishly to get this answer for my nephews.  Now I want to know how and if Eye Black under athletes eyes works&#8211;I&#8217;ll keep at it.</p>
<p>thanks</p>
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		<title>By: molly</title>
		<link>http://www.scienceline.org/2008/01/14/ask-tweed-yellowline/comment-page-1/#comment-1313</link>
		<dc:creator>molly</dc:creator>
		<pubDate>Mon, 21 Jan 2008 19:37:36 +0000</pubDate>
		<guid isPermaLink="false">http://scienceline.org/2008/01/14/ask-tweed-yellowline/#comment-1313</guid>
		<description>...totally interesting, completely random -- way to throw something new into the science story coffer.</description>
		<content:encoded><![CDATA[<p>&#8230;totally interesting, completely random &#8212; way to throw something new into the science story coffer.</p>
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