Doug Hurley and Bob Behnken are the only two people who know what it’s like to fly on a SpaceX rocket. On Friday, the pair revealed some more details about how it feels, and why the Falcon 9’s design changes things.
London (AP) — The pilot of a fighter jet that crashed into the North Sea, off the coast of northern England, has been found dead, the U.S. Air Force said Monday.
In a statement hours after the crash, it said “the pilot of the downed F-15C Eagle from the 48th Fighter Wing has been located, and confirmed deceased.”
It said this is a “tragic loss” for the 48th Fighter wing community and sent condolences to the pilot’s family.
An exotic physical phenomenon known as a Kohn anomaly has been found for the first time in an unexpected type of material by researchers at MIT and elsewhere. They say the finding could provide new insights into certain fundamental processes that help determine why metals and other materials display the complex electronic properties that underlie much of today’s technology.
The way electrons interact with phonons—which are essentially vibrations passing through a crystalline material —determines the physical processes that take place inside many electronic devices. These interactions affect the way metals resist electric current, the temperature at which some materials suddenly become superconductors, and the very low temperature requirements for quantum computers, among many other processes.
But electron-phonon interactions have been difficult to study in detail because they are generally very weak. The new study has found a new, stronger kind of unusual electron-phonon interaction: The researchers induced a Kohn anomaly, which was previously thought to exist only in metals, in an exotic material called a topological Weyl semimetal. The finding could help shed light on important aspects of the complex interplay between electrons and phonons, they say.
A US military jet has crashed into the North Sea off the coast of Yorkshire.
A major operation is underway after the F-15 fighter jet came down near Flamborough Head in East Yorkshire, south of Scarborough. The pilot is yet to be found.
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Quantum key distribution (QKD)1,2,3 is a theoretically secure way of sharing secret keys between remote users. It has been demonstrated in a laboratory over a coiled optical fibre up to 404 kilometres long4,5,6,7. In the field, point-to-point QKD has been achieved from a satellite to a ground station up to 1,200 kilometres away8,9,10. However, real-world QKD-based cryptography targets physically separated users on the Earth, for which the maximum distance has been about 100 kilometres11,12. The use of trusted relays can extend these distances from across a typical metropolitan area13,14,15,16 to intercity17 and even intercontinental distances18. However, relays pose security risks, which can be avoided by using entanglement-based QKD, which has inherent source-independent security19,20. Long-distance entanglement distribution can be realized using quantum repeaters21, but the related technology is still immature for practical implementations22. The obvious alternative for extending the range of quantum communication without compromising its security is satellite-based QKD, but so far satellite-based entanglement distribution has not been efficient23 enough to support QKD. Here we demonstrate entanglement-based QKD between two ground stations separated by 1,120 kilometres at a finite secret-key rate of 0.12 bits per second, without the need for trusted relays. Entangled photon pairs were distributed via two bidirectional downlinks from the Micius satellite to two ground observatories in Delingha and Nanshan in China. The development of a high-efficiency telescope and follow-up optics crucially improved the link efficiency. The generated keys are secure for realistic devices, because our ground receivers were carefully designed to guarantee fair sampling and immunity to all known side channels24,25. Our method not only increases the secure distance on the ground tenfold but also increases the practical security of QKD to an unprecedented level.
To create large quantum networks, researchers will first need to develop efficient quantum repeaters. A key component of these repeaters are quantum memories, which are the quantum-mechanical equivalents of more conventional computer memories, such as random-access memories (RAM).
Ideally, a quantum memory should be able to retain information for substantial periods of time, store true quantum states, read out data efficiently and operate at low-loss telecommunication wavelengths. While research teams have made great progress in the development of quantum memories, no solution proposed so far has been able to meet all of these requirements simultaneously.
With this in mind, researchers at Delft University of Technology (TU Delft) set out to develop a new mechanical quantum memory with sufficiently long storage times, a high readout efficiency, and the ability to operate at telecom wavelengths. The memory they devised, presented in a paper published in Nature Physics, could ultimately enable the practical implementation of mechanical systems with quantum effects developed in their previous works.
For the first time, a complete time-calibrated phylogeny for a large group of invertebrates is published for an entire continent.
In a recent research paper in the open-access, peer-reviewed academic journal ZooKeys, a German-Swedish team of scientists provide a diagrammatic hypothesis of the relationships and evolutionary history for all 496 European species of butterflies currently in existence. Their study provides an important tool for evolutionary and ecological research, meant for the use of insect and ecosystem conservation.
In order to analyse the ancestral relationships and history of evolutionary divergence of all European butterflies currently inhabiting the Old continent, the team led by Martin Wiemers—affiliated with both the Senckenberg German Entomological Institute and the Helmholtz Centre for Environmental Research—UFZ, mainly used molecular data from already published sources available from NCBI GenBank, but also contributed many new sequences, some from very local endemics for which no molecular data had previously been available.
In 2005, University of California, Berkeley, researchers made the surprising discovery that making conjoined twins out of young and old mice—such that they share blood and organs—can rejuvenate tissues and reverse the signs of aging in the old mice. The finding sparked a flurry of research into whether a youngster’s blood might contain special proteins or molecules that could serve as a “fountain of youth” for mice and humans alike.
But a new study by the same team shows that similar age-reversing effects can be achieved by simply diluting the blood plasma of old mice—no young blood needed.
In the study, the team found that replacing half of the blood plasma of old mice with a mixture of saline and albumin—where the albumin simply replaces protein that was lost when the original blood plasma was removed—has the same or stronger rejuvenation effects on the brain, liver and muscle than pairing with young mice or young blood exchange. Performing the same procedure on young mice had no detrimental effects on their health.
Why does this happen?
To put things as simply as possible, the root cause of all aging is a loss of energy on the cellular level, and there are basically two major theories for why this occurs. One says cellular energy decline is the result of accumulated cellular and mitochondrial damage. In other words, it’s the result of wear and tear on a cellular level. The other theory speculates that it is the result of genetic programming, with some genes getting overexpressed while others get underexpressed as we age.
These two theories of cellular energy decline aren’t in competition with one another. They just look at the problem from two different vantage points. The reality is these “causes” are interrelated. Gene overexpression and underexpression can cause cellular damage. Cellular damage can impair gene expressions.
