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 ...

The half-cut shell of the modern Nautilus (right). 3D-printed half-cut ammonite shell (left). Chamber model from the current study, cut to show internal geometry (top).

X-ray of Nautilus Shell (Edward Charles Le Grice, c.1910) shows how progressive rhythym can be found in nature. The shell is made up of a series of identically-shaped sections that grow larger as ...

Nautilus populations have declined by as much as 80% over the past few decades as a result of commercial interest in their shells and meat, according to Oceana, a non-profit focused on conservation.

Chambered Nautilus, 'Living Fossil' Depleted by International Shell Trade, Moves Toward Endangered Species Act Protection OAKLAND, Calif.— The National Marine Fisheries Service today announced it will ...

The U.S. Fish and Wildlife Service estimates that more than half a million nautilus shells or pieces of shell were imported into the U.S. between 2005 and 2008.

Another species called Nautilus pompilius swims above a rare Allonautilus scrobiculatus off the coast of Ndrova Island in Papua New Guinea. Before this July, the rare species was last seen in 1986.

Apr 11, 2025 Light that spirals like a nautilus shell Pushing the limits of structured light, physicists report a new type of optical vortex beam that not only twists as it travels but also changes in ...

Beams of light that can be guided into corkscrew-like shapes called optical vortices are used today in a range of applications. Pushing the limits of structured light, Harvard applied physicists ...