Claim: Oxygenic photogranules is a new type of biogranules that has promising bioengineering applications to wastewater treatment, but how they are produced by the filamentous and motile cyanobacteria (also known as the blue-green algae) from a source of activated sludge exposed to light is still far from understood.
Evidence: OPGs were discovered recently and serendipitously in laboratory conditions, but very similar granules, called cryoconites, are found in glaciers