The Arctic landscape during the Cretaceous Period may have been dominated by the dinosaurs, but the rivers and streams held something more familiar. Alaska’s fresh waters 73 million years ago were teeming with the ancient relatives of today’s salmon, pike and other northern fish. A new paper published this week in the journal Papers in Palaeontology has named three new species of fish from that time period, including a salmonid, dubbed Sivulliusalmo alaskensis.

Nitrous oxide is known as the gas used in whipped cream cartridges or as an anaesthetic in hospitals. But it’s much more than that. This potent greenhouse gas is also released from biological wastewater treatment plants (WWTPs), posing a real threat to our climate. PhD student Nina Roothans (University of Technology, Delft The Netherlands), who recently graduated cum laude, has identified practical strategies to reduce nitrous oxide emissions. Her groundbreaking work has now been published in Nature Water.

The new remotely operated diving robot MARUM-QUEST 5000 has dived for the first time. The dive took place as part of the ship expedition M210 from on board the research vessel METEOR in the Atlantic. If all technical requirements are met in time and the weather cooperates, the dives will be streamed live.

In a paper published in National Science Review, an international team of scientists provides seismic evidence of liquid water located 5.4 to 8 kilometers beneath the Martian surface. This water may originate from the ancient ocean that once existed on Mars, which was sequestered into the crust as the planet transitioned to a colder and drier climate during the Amazonian period (beginning ~3 billion years ago).