Otoscope images (75x).
Pine twig found on the sidewalk shows traces of sand.
http://www.shuttertalk.com/forums/at...t.php?aid=1068
http://www.shuttertalk.com/forums/at...t.php?aid=1067
http://www.shuttertalk.com/forums/at...t.php?aid=1066
http://www.shuttertalk.com/forums/at...t.php?aid=1065