> While we already knew that brittlestars have photoreceptors all along their bodies, we didn’t know exactly how they worked until now. > Using a combination o

> While we already knew that brittlestars have photoreceptors all along their bodies, we didn’t know exactly how they worked until now. > Using a combination of microscopic observations and RNA sequencing, the researchers speculate that in light, the animal’s pigment-containing cells constrict the photoreceptors. Emphasis mine in the above quotes. "To know exactly" and "to speculate" are just completely incompatible. It bugs me how badly written popular science is.