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| Direct sound printing is a potential game-changer in 3D printing Posted: 31 May 2022 11:01 AM PDT Researchers describe a new platform technology called direct sound printing (DSP), which uses soundwaves to produce new objects. The paper explains show how focused ultrasound waves can be used to create sonochemical reactions in minuscule cavitation regions. Extremes of temperature and pressure lasting trillionths of a second can generate pre-designed complex geometries that cannot be made with existing techniques. |
| Why Uranus and Neptune are different colors Posted: 31 May 2022 11:01 AM PDT Astronomers may now understand why the similar planets Uranus and Neptune are different colors. Researchers have now developed a single atmospheric model that matches observations of both planets. The model reveals that excess haze on Uranus builds up in the planet's stagnant, sluggish atmosphere and makes it appear a lighter tone than Neptune. |
| Posted: 31 May 2022 08:18 AM PDT Plant fossils dating back 55 to 40 million years ago, during the Eocene epoch reveal details about the warmer and wetter climate. These conditions meant there were palms at the North and South Pole and predominantly arid landmasses like Australia were lush and green. By focusing on the morphology and taxonomic features of 12 different floras, the researchers developed a more detailed view of what the climate and productivity was like in the ancient hothouse world of the Eocene epoch. |
| Great white sharks may have contributed to megalodon extinction Posted: 31 May 2022 08:18 AM PDT The diet of fossil extinct animals can hold clues to their lifestyle, behavior, evolution and ultimately extinction. However, studying an animal's diet after millions of years is difficult due to the poor preservation of chemical dietary indicators in organic material on these timescales. An international team of scientists has applied a new method to investigate the diet of the largest shark to have ever existed, the iconic Otodus megalodon. This new method investigates the zinc isotope composition of the highly mineralized part of teeth and proves to be particularly helpful to decipher the diet of these extinct animals. |
| Cuttlefish camouflage may be more complex than previously thought Posted: 31 May 2022 07:26 AM PDT A new study suggests that the European cuttlefish (sepia officinalis) may combine, as necessary, two distinct neural systems that process specific visual features from its local environment, and visual cues relating to its overall background environment to create the body patterns it uses to camouflage itself on the sea floor. |
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