Researchers have discovered scleractinian corals that are brightly fluorescent at depths of 50–60 m. Many of them glow brightly with fluorescent colours, ranging from green over yellow to red. The encounter of such a rainbow of coral colours in deep waters was unexpected since their shallow-water counterparts in the same reef contain only green fluorescent pigments.

At the time of its sinking, Rio de Janeiro was carrying a contingent of German soldiers meant for the invasion of Norway, which occurred on the following day, 9 April 1940. Of the 380 onboard, 50 were crew, the rest were soldiers. Of these numbers, almost 200 lost their lives, but 183 survived and were helped by the locals. Survivors told officials they were heading to Bergen, and even though they were wearing military uniforms, the Norwegian government failed to realize that a German invasion was imminent.

Animals are endowed with the capacity to repair injuries. Some animals simply heal the wound, whereas others are able to regenerate lost parts.

A new study now documents yet another and previously unidentified strategy of self-repair, where moon jellyfish respond to injuries by reorganizing existing parts, and rebuilding essential body symmetry, important for them to stay balanced as they travel around the ocean, without regenerating what is lost.

To track the sharks over a long period of time, researchers fitted 20 males and 4 females with satellite tags. These tags sent information about an individual’s position when it came to the water surface.