An anonymous reader quotes a report from Ars Technica: Atomic-scale imaging emerged in the mid-1950s and has been advancing rapidly ever since -- so much so, that back in 2008, physicists successfully used an electron microscope to image a single hydrogen atom. Five years later, scientists were able to peer inside a hydrogen atom using a "quantum microscope," resulting in the first direct observation of electron orbitals. And now we have the first X-ray taken of a single atom, courtesy of scientists from Ohio University, Argonne National Laboratory, and the University of Illinois-Chicago, according to a new paper published in the journal Nature.

"Atoms can be routinely imaged with scanning probe microscopes, but without X-rays one cannot tell what they are made of," said co-author Saw-Wai Hla, a physicist at Ohio University and Argonne National Laboratory. "We can now detect exactly the type of a particular atom, one atom at a time, and can simultaneously measure its chemical state. Once we are able to do that, we can trace the materials down to [the] ultimate limit of just one atom. This will have a great impact on environmental and medical sciences." [...] Hla has been working for the last 12 years to develop an X-ray version of STM: synchrotron X-ray-scanning tunneling microscopy, or SX-STM, which would enable scientists to identify the type of atom and its chemical state. X-ray imaging methods like synchrotron radiation are widely used across myriad disciplines, including art and archaeology. But the smallest amount to date that can be X-rayed is an attogram, or roughly 10,000 atoms. That's because the X-ray emission of a single atom is just too weak to be detected -- until now.

SX-STM combines conventional synchrotron radiation with quantum tunneling. It replaces the conventional X-ray detector used in most synchrotron radiation experiments with a different kind of detector: a sharp metal tip placed extremely close to the sample, the better to collect electrons pushed into an excited state by the X-rays. With Hla et al.'s method, X-rays hit the sample and excite the core electrons, which then tunnel to the detector tip. The photoabsorption of the core electrons serves as a kind of elemental fingerprint for identifying the type of atoms in a material. The team tested their method at the XTIP beam line at Argonne's Advanced Photon Source, using an iron atom and a terbium atom (inserted into supramolecules, which served as hosts). And that's not all. "We have detected the chemical states of individual atoms as well," said Hla. "By comparing the chemical states of an iron atom and a terbium atom inside respective molecular hosts, we find that the terbium atom, a rare-earth metal, is rather isolated and does not change its chemical state, while the iron atom strongly interacts with its surrounding." Also, Hla's team has developed another technique called X-ray-excited resonance tunneling (X-ERT), which will allow them to detect the orientation of the orbital of a single molecule on a material surface.

In India, children under 16 returning to school this month at the start of the school year will no longer be taught about evolution, the periodic table of elements, or sources of energy. Nature: The news that evolution would be cut from the curriculum for students aged 15-16 was widely reported last month, when thousands of people signed a petition in protest. But official guidance has revealed that a chapter on the periodic table will be cut, too, along with other foundational topics such as sources of energy and environmental sustainability.

Younger learners will no longer be taught certain pollution- and climate-related topics, and there are cuts to biology, chemistry, geography, mathematics and physics subjects for older school students. Overall, the changes affect some 134 million 11-18-year-olds in India's schools. The extent of what has changed became clearer last month when the National Council of Educational Research and Training (NCERT) -- the public body that develops the Indian school curriculum and textbooks -- released textbooks for the new academic year that started in May.

Researchers, including those who study science education, are shocked. "Anybody who's trying to teach biology without dealing with evolution is not teaching biology as we currently understand it," says Jonathan Osborne, a science-education researcher at Stanford University in California. "It's that fundamental to biology." The periodic table explains how life's building blocks combine to generate substances with vastly different properties, he adds, and "is one of the great intellectual achievements of chemists."

A SpaceX capsule carrying a former NASA astronaut and three paying customers returned from the International Space Station, marking the conclusion of a historic weeklong mission for the crew. From a report: The Crew Dragon spacecraft departed the space station Tuesday morning and the crew spent nearly 12 hours in orbit as the capsule maneuvered back toward Earth. After a fiery reentry, the Crew Dragon and passengers made a safe splashdown off the coast of Panama City, Florida, in the Gulf of Mexico at 11:04 p.m. ET. This mission, dubbed Axiom Mission 2, or AX-2, launched from Florida on May 21. AX-2 was put together by the Houston-based company Axiom Space and marked the second all-private mission to the orbiting outpost, meaning solely commercial companies, rather than a government agency, have been leading the mission.

This mission was also a milestone in the history of spaceflight as stem cell researcher Rayyanah Barnawi became the first woman from Saudi Arabia to travel to space. The AX-2 mission is one in a lineup of commercial missions designed to spur private sector participation in spaceflight -- particularly in low-Earth orbit, where the International Space Station orbits. Former NASA astronaut Peggy Whitson, 63, led the AX-2 crew. Whitson, now an Axiom Space employee, also became the first woman to command a private spaceflight. One of the three paying customers joining Whitson was John Shoffner, an American who made his fortune in the international telecom business and founded the hardware company Dura-Line Corp. Saudi Arabia also paid to fly two of its citizens: Barnawi and Ali AlQarni, a fighter pilot in the Royal Saudi Air Force.

During the mission, Barnawi led stem cell research suited for the microgravity environment aboard the space station. The orbiting laboratory has long been a key venue for various scientific experiments, as the lack of gravity can give researchers a better fundamental understanding of the topic at hand. Barnawi and AlQarni also engaged in outreach projects, including testing out a kite in microgravity and capturing video for viewers back home. The AX-2 crew spent about eight days working alongside astronauts representing NASA, Russia's Roscomos space agency and the United Arab Emirates Space Agency aboard the space station, though they operated on different schedules. The AX-2 crew worked through a lineup of more than 20 investigations and science projects -- including stem cell and other biomedical research. "Late tonight, at 11:02 pm local time in California (06:02 UTC Wednesday), SpaceX has a chance to reach 200 successful launches [of the Falcon 9 rocket] with a Starlink mission lifting off from Vandenberg Space Force Base," reports Ars Technica. "Such a performance is in uncharted territory for any orbital rocket, ever. [...] SpaceX is setting itself up to double the record for the number of consecutive successes by an orbital rocket."

You can view a livestream of the launch here.