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A real photograph of a single strontium atom suspended in an electric field.
This image was taken by David Nadlinger, a physicist at the University of Oxford, and it won the 2018 Engineering and Physical Sciences Research Council (EPSRC) science photo competition.
In the photograph, the atom is held almost motionless in place by a pair of metal electrodes.
The purple glow is the result of a laser causing the atom to emit visible light, which is then captured using a standard camera with a long exposure.
Atoms are typically millions of times smaller than anything a regular camera can capture.
However, when they are excited by lasers, certain atoms emit enough light to be photographed individually — as is the case here.
The atom appears as a tiny dot in the middle of the apparatus, made visible through a phenomenon called laser cooling and trapping, which slows down its motion to keep it still long enough for imaging.
This photo is considered historic because it's one of the few times humanity has visually captured a single atom with the naked eye (through the camera lens), instead of via electron microscopy or indirect imaging methods.A real photograph of a single strontium atom suspended in an electric field. This image was taken by David Nadlinger, a physicist at the University of Oxford, and it won the 2018 Engineering and Physical Sciences Research Council (EPSRC) science photo competition. In the photograph, the atom is held almost motionless in place by a pair of metal electrodes. The purple glow is the result of a laser causing the atom to emit visible light, which is then captured using a standard camera with a long exposure. Atoms are typically millions of times smaller than anything a regular camera can capture. However, when they are excited by lasers, certain atoms emit enough light to be photographed individually — as is the case here. The atom appears as a tiny dot in the middle of the apparatus, made visible through a phenomenon called laser cooling and trapping, which slows down its motion to keep it still long enough for imaging. This photo is considered historic because it's one of the few times humanity has visually captured a single atom with the naked eye (through the camera lens), instead of via electron microscopy or indirect imaging methods.
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🧬 Most Europeans Had Dark Skin Until Just 3,000 Years Ago New DNA Study Reveals 🌍✨
Think you know what ancient Europeans looked like? Think again.
A groundbreaking DNA analysis has revealed that for most of Europe’s history well into the Iron Age the continent’s population had dark skin, dark hair, and dark eyes. That means the image of pale-skinned Europeans is a relatively modern development, emerging only in the last few thousand years.
The study, which analyzed 348 ancient DNA samples from 34 countries across Europe and Asia, tracked how pigmentation traits evolved over the past 45,000 years. While lighter features first appeared around 14,000 years ago, they remained rare until about 3,000 years ago, when they began to spread more widely.
Why the shift? Scientists believe lighter skin may have offered a survival advantage in northern climates, helping the body better synthesize vitamin D with less sunlight. Traits like light eyes, however, may have spread due to sexual selection or genetic drift not necessity, but preference or chance.
It’s a powerful reminder that human appearance is fluid, shaped by migration, adaptation, and thousands of years of environmental and social change.
So next time you picture ancient Europe, remember: it looked very different than today and DNA is telling us the real story.🧬 Most Europeans Had Dark Skin Until Just 3,000 Years Ago New DNA Study Reveals 🌍✨ Think you know what ancient Europeans looked like? Think again. A groundbreaking DNA analysis has revealed that for most of Europe’s history well into the Iron Age the continent’s population had dark skin, dark hair, and dark eyes. That means the image of pale-skinned Europeans is a relatively modern development, emerging only in the last few thousand years. The study, which analyzed 348 ancient DNA samples from 34 countries across Europe and Asia, tracked how pigmentation traits evolved over the past 45,000 years. While lighter features first appeared around 14,000 years ago, they remained rare until about 3,000 years ago, when they began to spread more widely. Why the shift? Scientists believe lighter skin may have offered a survival advantage in northern climates, helping the body better synthesize vitamin D with less sunlight. Traits like light eyes, however, may have spread due to sexual selection or genetic drift not necessity, but preference or chance. It’s a powerful reminder that human appearance is fluid, shaped by migration, adaptation, and thousands of years of environmental and social change. So next time you picture ancient Europe, remember: it looked very different than today and DNA is telling us the real story.
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n a US first, surgeons at Baylor St. Luke’s Medical Center in Houston successfully performed a fully robotic heart transplant, replacing a failing heart without opening the chest or cutting the breastbone, using robotic tools to operate through small incisions.
The procedure reduced surgical trauma, blood loss, and infection risk, marking a major advance in transplant surgery by preserving the chest wall and enabling faster recovery, improved lung function, and lower chances of organ rejection.
The 45-year-old patient was discharged a month after the March operation without complications, with doctors calling the milestone a transformative moment.n a US first, surgeons at Baylor St. Luke’s Medical Center in Houston successfully performed a fully robotic heart transplant, replacing a failing heart without opening the chest or cutting the breastbone, using robotic tools to operate through small incisions. The procedure reduced surgical trauma, blood loss, and infection risk, marking a major advance in transplant surgery by preserving the chest wall and enabling faster recovery, improved lung function, and lower chances of organ rejection. The 45-year-old patient was discharged a month after the March operation without complications, with doctors calling the milestone a transformative moment.
2 Commentarios 0 Acciones 811 Views 0 Vista previa
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