MICROSCOPIC HAIRS IN INNER EAR: Inner ear help divers know their up down orientation in water. Sounds under water are magnified. When we hear sounds (whether under water or above) microscopic hairs in our inner ears vibrate.
This is bismuth, a brittle metal with an iridescent oxide tarnish that produces rainbow colours. It's the most naturally diamagnetic metal in the world, which means it can create a magnetic field in opposition to an externally applied magnetic field.
Geastrum saccatum. Photo: en.wikipedia.org.
Backlit leaf. Cairns Botanic Gardens. Photo: David Clode.