I hate that my first thought was of the fuckin Drake Sprite Robot commercial
If you go to the pool this summer, watch out for False Caustics. They look like the dancing lights at the bottom of the pool, but they stay mostly still.
False Caustics (Praya dulcis) are in fact siphonophores that colonize pools with poor filtration systems. If you swim through them, they will burn your skin. Their sting is rarely fatal, but it causes excruciating pain that can last several years.
These siphonophores are colonies of tiny organisms related to jellyfish. They are the only known species in their group to live in fresh water, and likely imitate caustics as a form of camouflage.
Wouldn't surprise me if we actually find one of those fuckers on a dig at some point
The oldest known instance of the "Cool S" symbol, a sigil of unknown origin, found on a Viking runestone dated to the tenth century AD.
This glyph has persisted through millennia and is still widely seen today. Scholars believe its origin is unrelated to the letter S, and that it may have originally been part of a religious ritual.