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Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. You have probably seen leaf-cutter ants carrying bits of plants, maybe in a nature documentary, at a science museum or in the “Circle of Life” song at the beginning of the 1994 Disney animated film “The Lion King.” Those ants don’t eat the leaves — instead they bring them back to their nests to feed a [...]

By Sandee LaMotte, CNN (CNN) — Tiny plastic shards and fibers were found in the nose tissue of human cadavers, according to a small new study. The threads and microplastic pieces were discovered in the olfactory bulb, the part of the nose responsible for detecting odors that sits at the base of the brain. “Once present in this structure, there can be translocation to other regions of the brain,” said lead study author Luís Fernando Amato-Lourenço, a [...]

That coffee you slurped this morning? It’s 600,000 years old. Using genes from coffee plants around the world, researchers built a family tree for the world’s most popular type of coffee, known to scientists as Coffea arabica and to coffee lovers simply as “arabica.” The researchers, hoping to learn more about the plants to better protect them from pests and climate change, found that the species emerged around 600,000 years ago through natural crossbreeding of two [...]

From deep in the Amazon rainforest, two dozen previously unknown pre-Columbian earthworks have been brought to light — and more than 10,000 such constructs may still be waiting to be discovered, according to new research. Across the Amazon basin, rainforests spread their leafy boughs over millions of kilometers. In the ground far below the treetops are ancient, long-hidden remnants of human habitation. They are preserved as ditches, paths and wells, sometimes forming geometric [...]

By Katie Hunt, CNN A plant-eating sauropod that lumbered around what’s now China some 162 million years ago had a neck that was about 10 feet longer than a typical school bus — and the longest of any known dinosaur. The creature’s 49.5-foot-long (15.1-meter) neck would have allowed it to stand in one spot and hoover up the surrounding vegetation — maximizing the amount of food it consumed while conserving energy. The fossilized remains of the dinosaur, called [...]

Recent telescope data revealed that a small planet in the far reaches of our solar system has a dense ring round it. And scientists are baffled as to why. The planet, Quaoar, is one of roughly 3,000 small planets that orbit the sun beyond Neptune, and at 690 miles (1,110-kilometers) wide, it’s about the seventh largest, with Pluto and Eris ranking as the biggest. Observations of Quaoar made between 2018 and 2021 revealed that the planet has a ring sitting farther away from it than [...]

(CNN) — Los investigadores encontraron dos nuevas especies de peces coloridos en la cuenca del Amazonas, y ya se encuentran en la lista de especies en peligro de extinción. Los peces pertenecen a una subfamilia llamada pez ciprínido de agua dulce sudamericano. El descubrimiento eleva a cinco el número conocido de especies de ciprínidos de agua dulce. Los investigadores han encontrado una nueva especie de pez, el Poecilocharax callipterus, en la cuenca del [...]

The fish belong to a subfamily called South American darters. The discovery brings the known number of darter species to five. One species, Poecilocharax callipterus, is distinguished by its long, striking red-orange fins and a dark spot at the base of its tail. The other new species, Poecilocharax rhizophilus is the most miniature darter ever identified. This tiny fish only measures about three-quarter inch (2 centimeters) in length as a mature adult. It’s bright yellow with a [...]

Two new colorful species of fish have been found in Brazil's Amazon Basin -- and they are already at risk of disappearing due to extinction. The fish belong to a subfamily called South American darters. The discovery brings the known number of darter species to five. One species, Poecilocharax callipterus, is distinguished by its long, striking red-orange fins and a dark spot at the base of its tail. The other new species, Poecilocharax rhizophilus is the most miniature [...]