Tears of joy and tears of sadness look different under the microscope

We can cry because we're happy. We can cry because we're sad. We can cry because we're cutting onions. We can cry just because we need to cry. They're all completely different emotions... but are they different tears? Photographer Rose-Lynn Fisher wanted to find out in her series The Topography of Tears. She put dried… » 11/20/13 8:02pm 11/20/13 8:02pm