How Big? - Checkout this Really Cool Website

How big is a dust mite?  What about a red blood cell?  Checkout this great website and get a view of some pretty small objects compared to the head of a pin.  http://www.cellsalive.com/howbig.htm

When you get to the website, click on "Start the Animation".  When the animation begins, click on the blue arrows next to the word "Magnification".  You can zoom in and out and get a real appreciation of things that are just too small for the unaided eye to see.  Have fun!