This rarely seen glass octopus bared all recently — even a view of its innards — when an underwater robot filmed it gracefully soaring through the deep waters of the Central Pacific Ocean.

For an octopus, almost any arm will do. New research published Thursday shows that octopuses have the ability to use any of their eight limbs to perform tasks like reaching, tiptoeing or grasping.

A Unique Wing Design One of the most striking features of dragonflies is their wings. Unlike most insects that flap their ...