What you can't see :  exploring our invisible world. 

 - [S.l] :  Discovery Channel,  c2011. 
 - 1 videodisc; sd.; col.;  4 3/4 in. 
<br/><br/> See your world in a new way! There are earthly forces, airborne particles and organisms that co-exist with humans beyond the limits of our eyesight. Using the cutting-edge laboratory techniques like scanning electron microscopes and specially photography, we can capture these rarely seen inhabitants of the invisible world all around us.  <br/> 
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<br/><br/><label>Dewey Class. No.: </label>DVD 576 W5561 2011