The 115m-long US Navy destroyer is widely known for her bold action in the Battle off Samar, the Philippines. The actions of the relatively lightly armed Johnston—sunk after a fierce battle with a large fleet of Japanese warships—helped stop the Japanese Admiral Kurita's Center Force from attacking vulnerable U.S.
Scientists used to think that only mammals and birds experienced different sleep states. More recent research, however, has revealed some reptiles and cuttlefish -- another cephalopod and relative of the octopus -- show non-REM and REM-like sleep.
A new study has found that the octopus has ‘quiet’ and ‘active sleep’, with different episode duration and periodicity, and experiences active sleep after a long episode of quiet sleep.
A number of new products are normally launched at the start of April, and this year did not disappoint.
We asked our contributors what their favorite underwater photography technique was and they sent us images and insights into a range of intriguing techniques from close-up wide-angle to use of reflective cylinders and Snell's window to circular fisheye and snoots to using sunballs and sunrays for backlighting as well as how to create black backgrounds.
