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# News Picks

Physics Today’s online staff summarize the most important and interesting news about science from the world's top media outlets.

There are 80 posts for the selected month (July 2015).

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July 30, 2015 12:05 PM

### Desert aquifers may serve as huge carbon sinks

New Scientist: A saline aquifer underneath a desert in northwest China has been found to contain surprisingly large amounts of carbon, according to Yan Li of the Chinese Academy of Sciences in Urumqi and colleagues. From water samples taken from the Tarim basin and from nearby rivers and other water sources that feed into it, the researchers have been able to create a timeline of how much and when carbon entered the closed drainage system. They found that the amount of carbon has increased dramatically because of human agricultural practices, which call for overirrigation of crops in desert areas to leach away the salt. The salt washed out of the soil makes its way into the aquifer, and the increasingly salty water is able to absorb and store more carbon than pure water. How much irrigating of deserts occurs around the world is unknown, but if the Tarim basin is any indication, the potential of similar aquifers to serve as carbon sinks could become increasingly important with the onset of global warming.
July 30, 2015 11:50 AM

### Obama establishes supercomputing initiative

Verge: On Wednesday, President Obama signed an executive order creating the National Strategic Computing Initiative (NSCI). The overall goal of the initiative will be to coordinate the US's efforts in high-power computing across a range of fields including medicine, nuclear research, weather forecasting, and aerospace. The most specific goal involves building an exascale computer by 2025. Such a computer would be 100 times as powerful as the two most advanced computers currently under development in the US—Summit and Sierra—which will both reach 100 petaflops when they are completed in 2017. Reaching the exascale level will require either massive amounts of power to supply the computer with energy or significant architecture breakthroughs to allow more efficient energy use.
July 29, 2015 4:26 PM

### SpaceShipTwo crashed because feathering system was released early

Verge: After Virgin Galactic's VSS Enterprise, an experimental SpaceShipTwo design, broke apart in flight last year, the National Transportation Safety Board (NTSB) found that the failure was due to the craft's wings, which had shifted position. Now the agency has confirmed that the problem was caused by human error. In normal operations, the wings are moved into a "feathering" position as the craft reaches apogee in order to slow it down for reentry into Earth's atmosphere. The NTSB's investigation revealed, however, that the copilot unlocked the wings while the craft was still climbing and before it went supersonic. As the craft passed Mach 1, the force on the unlocked wings pushed them into feathering position. Because the craft was not in the proper orientation for the feathering maneuver, the resulting forces on the craft caused it to break up. Virgin Galactic said that it has now added an inhibitor that prevents the wings from being unlocked before the craft has reached Mach 1.4.

July 29, 2015 3:40 PM

### UK report provides guidelines for dealing with solar storms

Guardian: Any day now Earth could experience a large-scale coronal mass ejection from the Sun that could cause far-reaching problems ranging from power outages to communications disruptions. Now the UK’s Department for Business Innovation and Skills has issued a report, Space Weather Preparedness Strategy, which spells out the potential dangers of such weather events and the steps the government should take to mitigate their effects. Among other things, the report proposes increasing the resilience of the nation’s infrastructure, establishing a system of warnings and alerts, and planning effective emergency response measures. Based on the Carrington event of 1859, people could have as little as 12 hours' advance warning of any similar impending severe solar weather event.
July 29, 2015 1:35 PM

### Teleportation at the quantum level

NPR: Teleportation may one day be possible, but rather than transferring matter from one point to another, it most likely will involve transferring information, according to Chris Monroe and David Hucul of the University of Maryland’s Joint Quantum Institute. Because any carbon atom is identical to any other carbon atom, the actual atoms that make up an object don’t need to be moved. Rather, the object could theoretically be rebuilt from the atoms at hand, if the states of all the atoms of the original object were known. To that end, the researchers have been working with a laboratory full of lasers, mirrors, and lenses to measure an atom’s information and transpose it to another. Although such a system of quantum teleportation would never work for moving people, they say, it could have its uses, such as in quantum computing.
July 29, 2015 1:25 PM

Scientific American: With the recent launch of Breakthrough Listen—the privately funded, large-scale search for extraterrestrial intelligence, or SETI—the governing committee of the Arecibo Observatory in Puerto Rico has been confronted with a problem: If the committee decides to partner with Breakthrough Listen and accept funding from Yuri Milner’s $100 million initiative, Arecibo, the world’s largest and most sensitive single-dish radio telescope, could risk losing its financial support from NSF, the US federal agency that owns it. Budget cuts have forced NSF to start divesting from older facilities in order to fund newer ones. Although funding from Breakthrough Listen would help to keep the facility running, it would not cover all the expenses, such as Arecibo’s basic operational costs. Whether NSF will continue to contribute to Arecibo's maintenance, however, depends on the details of the proposed partnership, which have yet to be provided to NSF by Arecibo’s management, and on how such a partnership would affect NSF’s broader mission regarding use of the telescope. July 28, 2015 3:42 PM ### Novel technique used to produce single-molecule transistor IEE Spectrum: A transistor consists of two electrodes, a source and a sink, and a gate that controls the flow of current between them. Recently researchers created a single-molecule transistor, and now a new and improved technique uses charged atoms for the gate. In this new transistor, a phthalocyanine molecule functions as the transmission channel, which rests on an indium arsenide substrate. Using a scanning tunneling microscope (STM), the researchers arranged indium ions around the H2Pc channel. The transistor turns "on" when enough indium ions are collected around the channel to create sufficient charge to alter the energy of the H2Pc molecule's electrons. When that happens, electrons from the STM, now being used as the transistor's source, can pass through the channel into the substrate. July 28, 2015 3:19 PM ### Japan plans to restart nuclear reactors soon World Nuclear News: After the Fukushima Daiichi Nuclear Power Plant was severely damaged by a tsunami and earthquake in 2011, Japan closed all of its nuclear power plants. The following year, the country established the Nuclear Regulation Authority (NRA), which drew up new standards for nuclear power plant operation. Now, after a series of upgrades and inspections at the Sendai Nuclear Power Plant, Kyushu Electric Power Company plans to ask the NRA to perform a final inspection of the Sendai 1 reactor. If no problems are found during the week-long process, which is expected to begin on 3 August, the reactor could start operations as soon as 10 August. It would be the first nuclear reactor to restart in Japan since 2011, and 20 more reactors are in line to follow. The government hopes that nuclear power will produce up to 22% of the country's electricity by 2030 and decrease its reliance on fossil fuel imports. July 28, 2015 12:50 PM ### Hillary Clinton comes out strong on green energy New York Times: Climate change may be one of the major issues in the 2016 presidential campaign. According to a recent poll by the New York Times, two-thirds of Americans favor political candidates who propose to take action on global warming. One presidential hopeful to take up the challenge is Hillary Clinton, who on Monday announced an ambitious goal to produce 33% of the US’s electricity from renewable sources by 2027. She has called for the installation of a half-billion solar panels by 2020 and for the generation of enough carbon-free energy to power every US home within a decade. Despite her strong support for green energy, however, some environmentalists say she must also develop a strong stance against fossil-fuel projects, such as the Keystone XL pipeline, on which she has so far refused to express an opinion, citing her role in evaluating the project when she was secretary of state. July 28, 2015 11:35 AM ### Turning cells into tiny lasers for medical diagnostics Nature: Biological cells have been turned into microlasers by injecting them with droplets of oil or fat mixed with a fluorescent dye. The droplets, which act as the gain medium, can then be activated by short pulses of light. Matjaž Humar and Seok Hyun Yun of Harvard Medical School are developing the technique to be used in the diagnosis and treatment of tumors and other medical conditions. Although luminescent probes have already been used with much success, the intracellular microlasers have a narrower emission spectrum, which allows for the tracking of thousands of cells simultaneously. The researchers have even experimented with using fluorescent polystyrene beads of different diameters to tag individual cells. July 27, 2015 2:13 PM ### Massive black hole found during study of archival data Scientific Computing: A black hole 100 million solar masses in size has been spotted in the process of devouring a star. While examining spectra of objects taken by the Sloan Digital Sky Survey, Andrea Merloni of the Max Planck Institute for Extraterrestrial Physics in Garching, Germany, and his colleagues found an unusual change between 1998 and 2005 in the spectrum of one galaxy located some 3.5 billion light-years away. Further confirmation of the high-energy emission came when the team discovered that both the European Space Agency's XMM-Newton and NASA's Chandra X-Ray Observatory, which had taken pictures of the region at about the same time, had also seen the massive flare. An analysis of the data from the three archival sources confirmed that the flare fit the model of a star being pulled into a massive black hole. July 27, 2015 1:03 PM ### First data from new LHC run are presented in Vienna Guardian: Researchers from CERN's Large Hadron Collider (LHC) are presenting their latest results at the European Physical Society's Conference on High Energy Physics in Vienna. The ATLAS team confirmed an unexpected finding from the CMS team during the previous LHC run—that regardless of the incident collision angle of the particles, there is an increased probability they are being emitted at a similar azimuthal angle. That behavior is expected in heavy particle collisions but not in proton–proton collisions. From the new run, ATLAS also released the first measurement of the jets of hadrons produced from the collision of quarks and gluons. The measurement, which is in line with the measurements taken during the previous run, reveals that the higher collision energy is producing noticeably more frequent jets. July 27, 2015 11:45 AM ### Brain revealed through photoacoustic imaging NPR: A new technique that combines “the speed and precision of light with the penetrating ability of sound” has been used to create high-speed, detailed three-dimensional images of a living mouse brain, writes Jon Hamilton for NPR. Developed by Lihong Wang of Washington University in St Louis, photoacoustic imaging uses a laser to send light pulses through the mouse’s skull and into its brain, where they bounce around and cause the molecules to vibrate. The vibrations emit distinctive sound waves, which can be used to monitor brain activity and study individual brain cells. The technique could one day be applied to other areas of the body to look for anomalies such as tumors in the breast, skin, and even individual blood cells. July 27, 2015 11:40 AM ### "Bubble" greenhouse proposed for remote, arid regions SciDev.Net: A sealed greenhouse that uses evaporation and condensation to desalinate saltwater for irrigation is being developed by researchers in Australia. In the design the evaporation equipment is located outside the greenhouse structure. Air is bubbled through water-filled columns to increase the air–water interface and encourage evaporation. Although the novel humidification–dehumidification process requires more energy than other desalination methods, such as solar-powered reverse osmosis, its simplicity and small scale could make it useful in isolated areas where local people with little training could set it up and run it. In addition, such a sealed structure would provide a cool, humid environment, which promotes plant growth, and would protect crops from insects and disease. July 24, 2015 12:10 PM ### Mammoth DNA suggests climate change was primary driver in extinction Science: Mammoths and many other large mammals suffered a massive population decline between 30 000 and 20 000 years ago that eventually led to their extinction. Human expansion, and the hunting associated with it, is widely considered to be a major factor in that decline, but a new study of DNA collected from mammoth fossils suggests that the populations were shrinking well before human expansion was significant. Alan Cooper of the University of Adelaide in Australia and his colleagues established a connection between the diversity of DNA found at specific sites and the size of the species population. Creating a timeline of temperature changes from sediment cores, they found that drops in DNA diversity, and therefore overall population size, were tied to periods of significant short-term warming. July 24, 2015 11:34 AM ### Chiral silicon could be used in light-based computing Science: Some schemes for photonic computing use light's polarization to store and transfer data. But if the data are to be transferred to a regular computer, a silicon-based means of measuring spin is needed, which so far has proved elusive to realize. Now Ritesh Agarwal of the University of Pennsylvania and his colleagues have discovered that by altering the structure of a silicon crystal, the material is no longer indistinguishable from its mirror image. That property allows silicon to be used to detect both polarization and electron spin because of the way light and electrons interact with the crystal. The availability of silicon detectors will significantly increase the rate at which photonic computing can transmit data. July 23, 2015 3:15 PM ### Berkeley passes controversial cell-phone radiation ordinance New York Times: The city of Berkeley, California, has passed a measure requiring cell-phone retailers to warn customers that prolonged use of the devices may be hazardous to their health. According to the Right to Know ordinance, people who regularly carry cell phones in a pocket or bra “may exceed the federal guidelines for exposure” to radio frequency radiation. However, the claim has not been substantiated by any scientific study. Furthermore, no adverse effects associated with low levels of radiation have been seen over the past 50 years and there has not been any noticeable increase in brain cancers, according to Jerrold Bushberg, a medical physicist and a professor of radiology and radiation oncology at the University of California, Davis, and a representative of the American Association of Physicists in Medicine. Regardless, proponents maintain that if there’s any possibility of risk, no matter how slight, the public should be made aware. The cell-phone industry has challenged the ordinance, and a federal hearing has been set for 6 August. July 23, 2015 2:12 PM ### UK continues to develop its human spaceflight research Nature: In December, Tim Peake will become the first astronaut to visit the International Space Station (ISS) as part of the UK's space program. The milestone will mark a major step for the UK Space Agency, which was established in 2010, and exemplifies the country's interest in participating in human spaceflight. A long-time contributor to the European Space Agency (ESA), the UK has participated primarily on telescope and robotic probe projects. However, in 2012 the country began expanding its involvement in human spaceflight by investing €20 million ($22 million) in the ISS and another €16 million in the ESA's European Programme for Life and Physical Sciences, which studies the effects of spaceflight on humans onboard the ISS.

July 23, 2015 12:40 PM

### Slips in ITER schedule mean China's fusion project may finish first

New Scientist: ITER, the international prototype fusion energy reactor being built in France, has seen costs triple to \$20 billion and has experienced construction delays that have pushed back completion to 2019. Designed to be the world's largest fusion facility, ITER is expected to be the first to produce more energy than was put into it. However, the delays may prevent it from achieving self-sustaining fusion reactions until the 2030s. That means that China, which is also participating in ITER, will likely finish construction on its own fusion project in time to reach that threshold first. The China Fusion Engineering Test Reactor is still in the design stage, but the country is heavily investing in the project and is likely learning quite a lot from its participation in ITER.

July 23, 2015 11:55 AM

### Foldable bridge created for use in emergencies

BBC: A new bridge design is being developed for use during natural disasters and other emergencies when local infrastructure has been damaged or is otherwise unusable. Called Mobile Bridge version 4.0, the scissors-like device can fold up compactly for transport and be readily expanded as needed. It’s the brainchild of Ichiro Ario of Hiroshima University and his colleagues, who recently tested a prototype at the Hongo River in Fukuyama, Japan. It can be fully deployed in just one hour and requires only a few people to set it up. The researchers say it is “the world’s fastest, largest, strongest, and lightest expanding temporary bridge.”
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