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Category: Life/death

100,000 simulations of comets striking Earth suggest the ingredients of life were not extraterrestrial

100,000 simulations of comets striking Earth suggest the ingredients of life were not extraterrestrial

Science Alert reports: Where did we come from? The answer, many scientists have proposed, is space. One longstanding theory, hypothesized for over a century, is that life on Earth emerged from fragments of prebiotic chemistry that arrived from the cosmic unknowns, possibly delivered by far-flung comets. The idea is supported by a growing body of evidence, with scientists detecting signs of organic molecules in comets soaring through space, which hypothetically could seed the ingredients of life on worlds they come…

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How did life arise?

How did life arise?

The New York Times reports: Life on planet Earth is a riot of diversity: ants and elephants, frogs and blue whales, tulips and redwoods, even a branch of the great apes known as humans. Uniting it all is biochemistry, in particular the shared biochemistry of genetic inheritance — DNA and RNA, the universal instruction kits of life. Tracing these biochemical threads back through time has convinced many scientists that all life descends from a so-called Last Universal Common Ancestor, or…

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Earth’s oldest evidence of life is written in stone – but it’s at risk of disappearing

Earth’s oldest evidence of life is written in stone – but it’s at risk of disappearing

Stromatolites at Hamelin Pool, Shark Bay, viewed from the boardwalk. Heidi Allen By Heidi Jane Allen, The University of Melbourne Today, our planet is teeming with life, but it has not always looked the same. Long before forests reached skyward, animals walked on land, and the rise and fall of dinosaurs, our planet was shaped by a much smaller, more unassuming form of life. And we can still find traces of it today. These ancient fossils, the earliest visible evidence…

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David Krakauer: ‘What we have to cultivate is amazing question-askers’

David Krakauer: ‘What we have to cultivate is amazing question-askers’

  Why did intelligence evolve in the universe? Neil deGrasse Tyson, Chuck Nice, and Gary O’Reilly explore the nature of intelligence, information theory, consciousness, and whether AI is actually intelligent at all with David Krakauer, evolutionary biologist and president of the Santa Fe Institute. Can you conceive of life without intelligence, or intelligence without life? We parse the difference between intelligence and being alive and whether you can be one without the other. What does it mean for something to…

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Ancient ‘living fossils’ may reveal how complex life began

Ancient ‘living fossils’ may reveal how complex life began

Science Daily reports: At first glance, stromatolites and their close relatives, microbial mats, can look like little more than dark, ancient rocks. In reality, they are densely packed, layered communities built by microbes. Billions of years ago, before animals and plants existed, stromatolites helped release some of the earliest oxygen into Earth’s atmosphere. Now, a study published in Current Biology suggests these unusual formations may also preserve clues to another major event in Earth’s history: the emergence of complex life….

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Is life just different?

Is life just different?

Philip Ball writes: In 1993, a team led by the planetary scientist Carl Sagan tentatively concluded that there is life on Earth. Not much of a deduction, you might think — except that the researchers confined their evidence to observations made by the Galileo spacecraft, which had flown past our planet three years earlier on a looping journey to Jupiter. So great is the transformative power of life that its presence can be detected just from the light and radio…

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What Ukrainian war widows know about love and loss

What Ukrainian war widows know about love and loss

Julie Reshe writes: ‘I died along with him in Huliaipole.’ This is how Tetiana Vatsenko-Bondareva, a Ukrainian widow, describes the day her husband was killed on the battlefield. ‘At first, you don’t understand anything – just an abyss, no time, no space, nothing at all. There is just some kind of existence,’ explained another war widow, Oleksandra Kolestyk. I first heard these words as figures of speech, the language of grief stretching beyond the limits of ordinary expression. Little did…

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What people regret most as death approaches

What people regret most as death approaches

Science Norway reports: Few people regret something they did. Many regret what they did not do. When researchers speak with people nearing the end of their lives, the answers they receive are surprisingly similar. The dreams I never pursued. The talents I never got to use. The journeys I never took. The relationships with other people that I let fade away. The decisions I was too afraid to make. When death draws near and people are asked what they regret…

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Neuroscience needs to stop treating the brain as if it is a computer

Neuroscience needs to stop treating the brain as if it is a computer

Àlex Gómez-Marín writes: What is a brain? The question might seem obvious, but it is not trivial. Neuroscience has progressed in the past century, with the development of sophisticated techniques to measure and manipulate brain cells, neural circuits and even animal behaviours. Yet how the brain actually works still eludes us. In The Brain, In Theory, neuroscientist Romain Brette deconstructs the predominant model of the brain, which treats the organ like a computer. He concedes that engineering metaphors can be…

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When Attenborough was welcomed by the mountain gorillas

When Attenborough was welcomed by the mountain gorillas

  David Sillito writes: It is the most memorable moment of Sir David Attenborough’s broadcasting career. A short sequence of his encounter with a group of playful mountain gorillas in a forest clearing in Rwanda. “There is more meaning and mutual understanding in exchanging a glance with a gorilla than any other animal I know,” he tells the camera, as a female gorilla observes him from just a few feet away. The footage for his 1979 Life on Earth series…

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We’re finally learning what it’s like to die. And it’s not as bad as you think…

We’re finally learning what it’s like to die. And it’s not as bad as you think…

Nate Scharping writes: The last words Steve Jobs, the legendary Apple founder, spoke were simple: “Oh wow, oh wow, oh wow.” Their mystery is enticing – what did Jobs, the digital prophet who brought us the smartphone, see as he neared death? We’ll never know. But stories of near-death experiences (NDEs) tantalise the living, and something unique seems to be happening inside our brains as we sense death approaching. Despite NDE testimonies, the moments surrounding death largely remain a mystery…

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All living things emit a visible light that vanishes at death, surprising study says

All living things emit a visible light that vanishes at death, surprising study says

Science Alert reports: Life truly is radiant, according to an experiment conducted by researchers from the University of Calgary and the National Research Council of Canada. An extraordinary experiment on mice and leaves from two different plant species has uncovered direct physical evidence of an eerie ‘biophoton’ phenomenon ceasing on death, suggesting all living things – including humans – could literally glow with health, until we don’t. The findings might seem a little fringe at first glance. It’s hard not…

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Life on Earth probably needed supplies from space

Life on Earth probably needed supplies from space

University of Bern: Earth is so far the only known planet on which life exists—with liquid water and a stable atmosphere. However, the conditions were not conducive to life when it formed. The gas-dust cloud from which all the planets in the solar system formed was rich in volatile elements essential for life, such as hydrogen, carbon and sulfur. However, in the inner solar system—the part closest to the sun, where the four rocky planets Mercury, Venus, Earth and Mars…

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Here’s how the first proteins might have assembled, sparking life

Here’s how the first proteins might have assembled, sparking life

Science reports: Life today depends on proteins, cellular workhorses that do everything from flex muscles to ferry oxygen. And proteins, in turn, depend on RNA, which carries the recipes for making them and also helps with their assembly. In modern cells, large protein-based enzymes help connect RNA snippets to amino acids, the building blocks of proteins. Then, the RNA- and protein-based cellular machine called the ribosome stitches the amino acids together into a protein chain, reading the correct sequence from…

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Life on Earth emerged fast — far quicker than we thought

Life on Earth emerged fast — far quicker than we thought

Michael Marshall writes: Here’s a story you might have read before in a popular science book or seen in a documentary. It’s the one about early Earth as a lifeless, volcanic hellscape. When our planet was newly formed, the story goes, the surface was a barren wasteland of sharp rocks, strewn with lava flows from erupting volcanoes. The air was an unbreathable fume of gases. There was little or no liquid water. Just as things were starting to settle down,…

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