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<blockquote>
<h1>How Big is a ... ? </h1>
<blockquote>
<p align="left">The head of a pin is about 2mm in diameter. Use this
animation to compare the relative sizes of cells and organisms sitting
on a pinhead. Nearly invisible without magnification, dust mites
dwarf pollen grains and human cells. In turn, bacteria and viruses
are even smaller.</p>
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AC_FL_RunContent( 'codebase','http://active.macromedia.com/flash2/cabs/swflash.cab#version=4,0,0,0','id','power10','width','550','height','400','src','swf/howbig','loop','false','quality','high','bgcolor','#FFFFFF','pluginspage','http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash','movie','swf/howbig' ); //end AC code
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<img src="pics/new.gif" alt="New Item." width="46" height="15" /> <em>HowBig
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Presentation</a>.</em> </p>
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<blockquote>
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<p>How to use:</p>
<ul>
<li>Use the left and right arrows to change magnification. </li>
<li>Click on the magnifications (1, 10, 100...) for a "Power of
Ten" zoom. </li>
<li>Choose an individual cell or organism (right) to bring it into
view. </li>
<li>Use the scale to measure individual cells. </li>
</ul>
<p> </p>
</blockquote>
<p align="center">1 millimeter = 0.001 meter<br />
1 micron = 0.000001 meter<br />
1 nanometer = 0.000000001 meter</p>
<p> </p>
<blockquote>
<h2 align="left"><em>Some Keywords</em>:</h2>
<p align="left">metric system, micron, angstrom, virus, bacteria, nanotechnology </p>
</blockquote>
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