scum

Biofilms form dental plaque and pond scum, but they can also create beautiful, tie-dye formations and protect shipwrecks from deteriorating.

Some common types are pond scum and even dental plaque, and biofilm can even preserve shipwrecks by coating the metal exterior and preventing corrosion.

These freshwater blooms may look like scum, foam, mats or even paint floating atop the water.

On Earth, such sediments have preserved evidence of ancient life in the form of fossilized mats of microscopic pond scum called stromatolites.

Intensely satisfying to use, these bad boys easily bust through even the grimiest, most built-up of messes—the soap scum on tubs, fat caked grill tops, and, of course, the toughest grout stains.

Scum it off with your spoon, and lay it in anotherPage 117 dish.

The home missions class furnished the inspiration for it, and called it "Scum o' the Earth," an impromptu immigration pageant.

Let all this boil together a full hour, and keep it constantly skimmed, as long as any Scum will rise upon it.

Scum like you has ter come ter the mark sooner or later, and come yer have.

On Scum exist the lowest conditions of life found in any stellar world.