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There are hundreds of freshwater mussel species, Amacker explained, and almost every one tricks a particular species of fish into raising its larvae. Sources: U.S. Fish & Wildlife Service Environmental Conservation Online System; U.S. Federal Endangered and Threatened Species by Calendar Year https://ecos.fws.gov/ecp/report/ species-listings-by-year-totals (annual data through 2022); Listed Species Summary (Boxscore) https:// ecos.fws.gov/ecp/report/boxscore (cumulative data up to September 18, 2023, and annual data for coral); Delisted Species https://ecos.fws.gov/ecp/report/species-delisted (delisted data through 2022) Number of Species Added to the Endangered or Threatened List Each Year* SPECIES REMOVED FROM THE ENDANGERED OR THREATENED LIST* At the end of 2022, some 90 U.S. species had been removed from the Endangered or Threatened lists. ScientificAmerican.com/magazine/sa Snail Darter Percina tanasi Listed as Endangered: 1975 Status: Delisted in 2022 Bald Eagle Haliaeetus leucocephalus Listed as Endangered: 1967 Status: Delisted in 2007 Gopher Tortoise Gopherus polyphemus Listed as Threatened: 1987 Status: Still threatened Snail Darter, Back in Action In the 1970s the Snail Darter, a tiny fish, seemed confined to a segment of the Little Tennessee River, right where the huge Tellico Dam was being built. FEATURES A BALD EAGLE DISAPPEARED into the trees on the far bank of the Tennessee River just as the two researchers at the bow of our modest motorboat began hauling in the trawl net. [Extracted from the article]

The fire in 1831 spared the Cathedral of Notre Dame itself. The rioters scrambled up the roof and toppled a giant Iron cross; they shattered stained glass, took axes to [...]

'We Just Need More Hands': Climate change's effects are 'horrifying,'but two experts see promise in public action. DURING THE decades-long struggle to forestall climate change, some moments looked like watersheds [...]

The pandemic has reminded us of the urgent need to stop abusing the planet. It could inspire us to prevent the looming climate disaster--if we can resist a return to [...]

IN AMSTERDAM I met a man who revealed to me the hidden currents of our lives--the massive flows of raw materials and products deployed, to such wonderful and damaging effect, [...]

Content not available due to copyright restrictions. SHANGHAI, CHINA Near the center of this city of 24 million, China's largest, the Yanan expressway crosses under the North-South expressway. The country [...]

To plunge headlong into the audacity of Dubai--the sprawling efflorescence of concrete, glass, and steel that has sprung up over the past three decades on the scorched sands of Arabia--you [...]

More than a million refugees arrived last year, many fleeing wars in Syria, Afghanistan, and Iraq. Hundreds of thousands more have come this year, as the continent's latest great migration [...]

Germany's energy revolution aims to replace nukes and fossil fuels. Could it be a model for the world? Hamburg knew the bombs were coming, and so the prisoners of war [...]

Unhealthy. Nutritious. Cruel. Delicious. Unsustainable. All-American. In the beef debate there are so many sides. At Wrangler Feedyard, on the High Plains of the Texas Panhandle, night was coming to [...]

The Romans had a serious trash problem, though by our standards it was good-looking trash. Their problem was amphorae. They needed millions of the curvy clay jars to ship wine, [...]

Glaciers are supposed to advance or retreat at a glacial pace. Now they're disappearing before our eyes. We know the climate is changing, but wrapping our minds around that fact [...]

It was five days before Christmas, and in the hut on the north flank of Eyjafjallajokull, the volcano that grounded airplanes all over Europe in 2010, Sigurdur Reynir Gislason was [...]

Earth was hot and ice free at the end of the Paleocene epoch. With sea level 220 feet higher than now, the Americas--not yet joined by continental drift--were smaller. Look [...]

One day in Delft in the fall of 1677, Antoni van Leeuwenhoek, a cloth merchant who is said to have been the long-haired model for two paintings by Johannes Vermeer--'The [...]

One day in 1963, when Jim Boucher was seven, he was out working the trapline with his grandfather a few miles south of the Fort McKay First Nation reserve on [...]

IF THERE IS one thing that has always seemed obvious about homosexuality, it's that it just doesn't make sense. Evolution favors traits that aid reproduction, and being gay clearly doesn't [...]

When provided with continuous nourishment, trees, like people, grow complacent. Tree-ring scientists use the word to describe trees like those on the floor of the Colorado River Valley, whose roots [...]

On the day after the hottest day in British history, in a small, stuffy office at the University of Cambridge, Simon Baron-Cohen's empathy is being put to the test. He [...]

The article presents the interview with Katharine Hayhoe, a climate scientist at Texas Tech University. Topics include the scientists are starting to be able to do is put numbers on how much worse climate change made specific events, the numbers are horrifying with the deadly floods in Germany, and the attribution study showed they were as much as nine times more likely as a result of a changing climate.

The article focuses on efforts in undersea mining by David Heydon and his company Nautilus Minerals. The focus of the mining is on hydrothermal vents, called black smokers. Superheated salt water from the vents draws minerals out from volcanic rock below the seafloor. The minerals build up and can be a source of copper, zinc, and silver. Nautilus plans to mine a sulfide deposit called Solwara 1, on the slope of the volcano North Su, not far off the coast of Papua New Guinea.

The article features different air scrubbers that can capture carbon dioxide. The air scrubber developed by Klaus Lackner of Columbia University in New York City, New York, and his colleague Allen Wright collects just a few tens of kilograms of carbon dioxide a day from air blowing through the gaps between vertical sheets of the plastic. The prototype of David Keith of the University of Calgary and his student Joshuah Stolaroff is a 4-meter-high cylinder of heavy-duty cardboard lined with polyvinyl chloride (PVC).

The article discusses the quest to discover an inhabited planet which is similar to earth. The United States National Aeronautics & Space Administration mission Kepler is addressed in the article. The spacecraft Corot and the Spitzer and James Webb Space telescopes are also discussed. The author notes the need for a telescope which detects life. It is noted that Kepler will tell astronomers what type of telescope is needed to monitor planets which are likely about 300 light-years away.

The article focuses on ideas for halting global warming that utilize geoengineering, or deliberately altering the climate with technology. Ideas fit into two categories: affecting how much sunlight reaches Earth's surface or affecting how much heat escapes into space, which involves carbon dioxide (CO2). However, little research has been done into unpredictable side effects and plans for blocking sunlight, for instance, do not solve the underlying problems.

The article provides a survey of the various energy resources human beings are currently using. Included are facts explaining where they are in greatest supply, the natural processes by which those resources come to be, and the technological advancements that are being made with regard to their use and appropriation. Some of the energy sources profiled in the article are oil, natural gas, coal, and wind.

This article reports on the growing concentration of carbon dioxide (CO2) in the global atmosphere and discusses means to abate it, including scientific theories that it may be possible to increase the natural capacity of the ocean to absorb CO2. Television news network Cable News Network (CNN), will air a program dealing with this issue called "Planet in Peril," to air Monday nights at ten o'clock.

The article reports on scientific research efforts to catalog and study the ecology of the ocean floor. Details are given concerning the utilization of the newfound accessibility of certain arctic regions due to ice-shelf melting in 2002. A brief overview of the ocean ecosystem is also given, citing its simple structure but complex amounts of biodiversity.

The article focuses on the intensification of the global-warming debate due to the occurrence of hurricanes Katrina, Rita and Wilma. It argues that there is no possibility that global warming and hurricanes are connected to one another. But it also states that there is a good reason to think that global warming might make the hurricanes more powerful. It discusses two studies that suggest the increasing intensity of tropical cyclones worldwide.

Provides information on X-ray sky. Facts about the exploration of Geiger counter into space; Key features of ACIS, camera of the Chandra X-ray Observatory launched by the U.S. National Aeronautics & Space Administration in 1999; Explanation on supernova.

Focuses on the works of the research team of Spencer Wells and Luigi Luca Cavalli-Sforza on human genetics. Use of markers for the classification of mutations in the DNA; Expedition of Wells in Central Asia to collect blood samples for their research; Analysis conducted by Tatiana Zerjal, a colleague of Wells, on the chromosomes of Central Asian men to trace their origins back to conqueror Genghis Khan.