Are you a crier? Do you cry when the wind blows too hard? Do you know someone that never cries? For years scientists have argued about the reasons we cry. Tears of joy appear to be expressed in the same manner as tears of sadness. It's only the emotion that distinguishes the two. And, surprisingly, the tears we shed when chopping onions are chemically different than the tears we cry when expressing our feelings. Take a listen to hear some interesting research findings in the up-and-coming field of the science of crying. Enjoy!