These rocks in your head keep you balanced

The beautiful colored image above might look like beach pebbles, yet in reality it shows a glimpse from an even tinnier world – it’s a colored scanning electron micrograph (SEM) of calcium carbonate deposited on the surface of an otolith, found in the Acoustic Macula. These tiny debris also fit a purpose, helping the body stay in equilibrium, whether in static (position of the head) or dynamic equilibrium (relative position function of linear acceleration)

Primitive sea creature has eyes made of rock

  This weird armored mollusk is called a chiton, and scientists are amazed by it. They discovered eye-like structures on its body decades ago, but they had no idea what they were made of, if they could see or just sense light, or even if they were eyes at all, because they were structurally very different from everything we’ve encountered