The strangest, saddest and funniest moments from around the world

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 tears from all different kinds of situations under the microscope to see what's different between them all.