The optical rotatum's logarithmic spiral follows a pattern found often in nature, including nautilus shells. Credit: Capasso Lab / Harvard SEAS The optical rotatum's logarithmic spiral follows a ...

Modern Nautilus and Allonautilus species inhabit deeper waters than their extinct ancestors did over 500 million years ago.

How does a species survive hundreds of millions of years unfazed? You must live in a shell – and it must grow with you, chamber by chamber Where to start with the nautilus: at the centre of the spiral ...