Ships and even small boats are a major source of noise and other pollution, a growing concern along today’s crowded coasts. One solution: a waterjet technology being developed by Rolls-Royce Naval Marine in Walpole, MA. The waterjets propel ships by shooting water out their sterns, allowing them to maneuver in water that would be too shallow for comparably sized vessels that rely on propellers and rudders. And unlike the waterjets used in personal watercraft and some ferries, which expel water above the vessels’ waterlines, the new design discharges the propulsive stream underwater, thereby reducing wake and lowering noise. The Rolls-Royce waterjet operates at 30,000 to 50,000 horsepower-suitable for propelling fast ships like naval destroyers, which would benefit from the underwater jets’ stealth. Smaller boats also may benefit from similar technology, though; a 2,000-horsepower version is scheduled for testing in spring 2003.
Geoffrey Hinton tells us why he’s now scared of the tech he helped build
“I have suddenly switched my views on whether these things are going to be more intelligent than us.”
ChatGPT is going to change education, not destroy it
The narrative around cheating students doesn’t tell the whole story. Meet the teachers who think generative AI could actually make learning better.
Meet the people who use Notion to plan their whole lives
The workplace tool’s appeal extends far beyond organizing work projects. Many users find it’s just as useful for managing their free time.
Learning to code isn’t enough
Historically, learn-to-code efforts have provided opportunities for the few, but new efforts are aiming to be inclusive.
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