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Ok I’ll be the guy to call it out. That looks like a glass bead, not a water droplet.
* It’s perfectly spherical. Water drops on even the most hydrophobic surfaces are clearly [deformed.](http://en.wikipedia.org/wiki/File:A_water_droplet_DWR-coated_surface2_edit1.jpg)
* There is a sharp edge where the water on the surface meets the bead on the left side, below the ant’s legs. This means that it’s water on the flat surface adhering to a solid material. If both were water, the cohesion would pull the water droplet flat to minimize surface area.
* The bottom of the sphere is clearly visible (though refracted) in the apron of water surrounding the bottom of the bead.
Despite all the above, it’s still a beautiful picture and I upvoted it.