#2296: Sourdough Starter explain

[Cueball stands in front of a kitchen counter looking down at a glass jar he is holding in both hands. The jar’s flat lid is lying on the table. There is another large jar farther back on the counter with a lid, with a small handle, on. In both jars there is a substance, which do stay in the same position in the jar even though Cueball tilts the jar he is holding.]

Cueball: My sourdough starter is coming along nicely!

[Caption below the panel]

Theory: The coronavirus is a yeast symbiont with an extremely convoluted parasitic life cycle.