Group items tagged

Drought is perhaps the most complex and least understood of all weather and climate extremes. Despite an increasing drought risk in a future warmer climate, this risk is often underestimated and continues to remain a "hidden hazard." Drought can span timescales from a few weeks to decades, and areas from a few kilometers to entire regions. Impacts usually develop slowly, are often indirect and can linger for long after the end of the drought itself.

"I have come to the conclusion that capitalism is successful primarily because it can impose the majority of the costs associated with its economic activities on outside parties and on the environment. In other words, capitalists make profits because their costs are externalized and born by others. In the US, society and the environment have to pick up the tab produced by capitalist activity. In the past when critics raised the question about external costs, that is, costs that are external to the company although produced by the company's activities, economists answered that it was not really a problem, because those harmed by the activity could be compensated for the damages that they suffered. This statement was intended to reinforce the claim that capitalism served the general welfare. However, the extremely primitive nature of American property rights meant that rarely would those suffering harm be compensated. The apologists for capitalism saved the system in the abstract, but not in reality."

In the not-too-distant past, narratives were set more or less consensually by the New York-based media establishment (assisted by its Washington-based enablers). But as Martin Gurri and Bruno Maçães have shown, the narrative-setting days of elite media are now over, and we live in a world of fractured narratives proffered by Extremely Online factions that interpret reality-or jettison it entirely, in favor of constructing their own "unreality" (Maçães' phrase)-primarily through the lens of their own self-justifying and unfalsifiable narratives.

In December, Antarctica lost its status as the last continent free of COVID-19 when 36 people at the Chilean Bernardo O'Higgins research station tested positive. The station's isolation from other bases and fewer researchers in the continent means the outbreak is now likely contained.

Athena Akrami's neuroscience lab reopened last month without her. Life for the 38-year-old is a pale shadow of what it was before 17 March, the day she first experienced symptoms of the novel coronavirus. At University College London (UCL), Akrami's students probe how the brain organizes memories to support learning, but at home, she struggles to think clearly and battles joint and muscle pain. "I used to go to the gym three times a week," Akrami says. Now, "My physical activity is bed to couch, maybe couch to kitchen." Her early symptoms were textbook for COVID-19: a fever and cough, followed by shortness of breath, chest pain, and extreme fatigue. For weeks, she struggled to heal at home. But rather than ebb with time, Akrami's symptoms waxed and waned without ever going away. She's had just 3 weeks since March when her body temperature was normal.

Unlike conventional micro-transistors, magnetic tunnel junctions don't use the electrical charge of electrons to store information, but take advantage of a quantum-mechanical property that electrons have, which is referred to as "spin." Known as spintronics, computing technology based on magnetic tunnel junctions is still very much in the experimental phase, and applications are extremely limited. For example, the technology is used in aircraft and slot machines to protect stored data from sudden power outages. This is possible because magnetic tunnel junctions process and store information by switching the orientation of nano-scale magnets instead of moving electrons around as regular transistors do.

An international research team from Germany and France has created structures in which light fields interact with electrons so strongly that the quantum vacuum itself is significantly altered. Using extremely short bursts of light, they interrupted this coupling much faster than the timescale of a vacuum fluctuation and observed an intriguing ringing of the emitted electromagnetic field, indicating the collapse of the vacuum state. Their key achievement could improve our understanding of the nature of nothingness-the vacuum of space itself, paving a way toward photonics exploiting vacuum fluctuations. The results are published in the current issue of Nature Photonics.