These are octopus eggs! When a female octopus is ready to mate she releases a chemical to let males know, causing them to fight over her. The winner gives her packages of sperm called 'spermatophores' and she then seals herself into a den where she lays and fertilises her eggs. A female octopus can lay tens of thousands of eggs, and they all hang from the roof of the den. After up to around six and a half months (depending on the species) of caring for them, the babies hatch and swim to the surface. The female octopus then crawls out of the den and dies
This photograph shows a lens created by spherical water droplets through which light refracts (bends). Not only is it beautiful, but it is also physics!
