Sachiko Kodama: ‘Ferrofluids appear as black fluid and are made by dissolving nanoscale ferromagnetic particles in a solvent such as water or oil. They remain strongly magnetic even in a fluid condition which makes them more flexible than iron sand.’
Kimberella. Kimberella crawled along the sea floor looking for edible scraps because organisms didn't start predation until the Cambrian Period. Kimberella dwelt in shallow waters (up to tens of meters in depth), sharing the calm, well-oxygenated sea floor with photosynthetic organisms and microbial mats.