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Is there a slight possibility that advanced alien civilizations may have already found us without us even noticing?
According to experts, intelligent alien beings may be quietly watching over humankind in a kind of ‘galactic Zoo.’
Scientists say that despite us still not finding evidence that aliens exist, it doesn’t mean that aliens haven’t found us.
Poor sleep and other issues with circadian rhythm are common for people with Alzheimer’s disease. Now researchers may have a clue to why.
“If your circadian clock is not quite right for years and years—you routinely suffer from disrupted sleep at night and napping during the day—the cumulative effect of chronic dysregulation could influence inflammatory pathways such that you accumulate more amyloid plaques,” says Erik Musiek. (Credit: Getty Images)
Fractured sleep, daytime sleepiness, and other signs of disturbance in one’s circadian rhythm are common complaints of people with Alzheimer’s disease, and the problems only get worse as the disease progresses.
After nearly 300 million miles (470 million km), NASA ’s Perseverance rover completes its journey to Mars on February 18, 2021. But, to reach the surface of the Red Planet, it has to survive the harrowing final phase known as Entry, Descent, and Landing.
The mission uses technological innovations already demonstrated successfully, especially for entry, descent, and landing (EDL). Like NASA’s Curiosity rover (, the Mars 2020 spacecraft uses a guided entry, descent, and landing system. The landing system on Mars 2020 mission includes a parachute, descent vehicle, and an approach called a “skycrane maneuver” for lowering the rover on a tether to the surface during the final seconds before landing.
Posted in particle physics
In October, NASA announced the first selection of a scientist to conduct research aboard a commercial spaceflight mission. I am that scientist, and I will be flying aboard Virgin Galactic’s Spaceship 2.
On that flight, which will reach altitudes over 300, 000 feet, I’ll be conducting experiments to further both astronomy and space life sciences.
This is a game-changing move by NASA. Why? Because it represents a normalizing of research in space to be more like other research disciplines, such as field geology, oceanography and volcanology, where researchers do their work themselves in the field, rather than designing, building and testing robots to go in their stead. The end result of this important evolution will be beneficial in many ways.
The Istanbul Metropolitan Municipality is working on an artificial intelligence (AI) project to ease the city’s notorious traffic jams, daily Milliyet has reported.
“By analyzing images from junctions, the system will activate traffic lamps and turn them green in a short time to ease traffic flow,” said Esat Temimhan, the director of Istanbul IT and Smart City Technologies (İSBAK), an sub unit of the municipality.
The AI system has started in two pilot regions, he said.
Scientists in Australia have developed a process for calculating the perfect size and density of quantum dots needed to achieve record efficiency in solar panels.
Quantum dots, man-made nanocrystals 100, 000 times thinner than a sheet of paper, can be used as light sensitisers, absorbing infrared and visible light and transferring it to other molecules.
This could enable new types of solar panels to capture more of the light spectrum and generate more electrical current, through a process of ‘light fusion’ known as photochemical upconversion.
Researchers at Chalmers University of Technology, with collaborators at Technische Universität Berlin, have demonstrated the shortest wavelength ever reported of a vertical-cavity surface-emitting laser (VCSEL). This can pave the way for future use in, for example, disinfection and medical treatment. The results were recently published in the scientific journal ACS Photonics.
“Although there is still much work to be done, especially to enable electrically driven devices, this demonstration provides an important building block for the realization of practical VCSELs covering the major part of the UV spectral range,” says Filip Hjort, Ph.D. student at the Photonics Laboratory at MC2 and first author of the article.
A vertical-cavity surface-emitting lasers (VCSEL) is a compact semiconductor laser and has seen widespread application in, for example, facial recognition in smartphones and for optical communication in data centers. So far, these lasers are only available commercially with red and infrared wavelengths, but also other visible-emitting VCSELs, that could find applications in adaptive headlamps for cars or projection displays, will soon be commercialized.
