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A rat can appear completely silent while making a sound that falls far beyond the range of human hearing. Around 50 kilohertz, these ultrasonic vocalisations are produced during play, social interactions and other rewarding situations, and tickling can bring them out in particularly high numbers.

Plastic alternatives made from renewable materials often struggle to match the strength, heat resistance and processing ability of conventional plastics. A new bamboo-based bioplastic takes a different approach, reorganising cellulose at the molecular level to produce a material that is both strong and easier to shape.

A rainbow of light forms because different wavelengths travel through a prism or water droplets at different angles. Scientists have now shown that sound can be made to behave in a way that splits a broadband acoustic signal into separate frequency components that travel in different directions or come to rest at different positions within a material.

Sixteen years after the Deepwater Horizon oil spill injured extensive coral habitats in the Gulf of Mexico, scientists are developing new ways to help these fragile ecosystems recover. According to NOAA Fisheries, a recent restoration mission combined laboratory-reared corals, specialised technical diving and newly designed equipment to return corals to the deep seafloor.

Not everyone who closes their eyes and hits the bed at night goes to sleep. Some end up transitioning into a dream-like state that has them waking up while feeling hazy, lazy and heavy, with no feelings of rest and freshness.

Scientists have pieced together the deepest genetic history of the North American bison ever assembled, using DNA drawn from 115 animals that lived before the species was pushed to near extinction in the 20th century. As per the findings, led by researchers at the University of California, and featured on the cover of the 6 August issue of Science, this offers the first genomic baseline for what healthy bison diversity looked like before hunting, new diseases, habitat destruction and government eradication campaigns reduced the population from tens of millions to a few hundred.

A decade ago, more than 99% of sunflower sea stars vanished from the depths of the ocean. Now, the discovery of a long-lost colony of these organisms is offering new hope for the region's kelp forests.

Dog parents, this is your 'told you' moment! All those times you felt your dog sensed your mood before you even said a word, that wasn't nothing.

Across the United States, glyphosate is applied across an enormous area of farmland each year. According to the US Environmental Protection Agency, an average of 298 million acres of cropland receives glyphosate applications annually, giving a sense of how routinely the herbicide enters agricultural landscapes.

In 1922, biologist Olaus J. Murie entered Alaska's vast wilderness to study caribou, beginning a body of field research that would eventually influence how scientists and park managers understood wildlife as part of interconnected ecosystems.