Browsed by
Category: Evolution

Why did Darwin’s 20th-century followers get evolution so wrong?

Why did Darwin’s 20th-century followers get evolution so wrong?

James A Shapiro writes: Since 1859, when Charles Darwin’s On the Origin of Species was first published, the theory of natural selection has dominated our conceptions of evolution. As Darwin understood it, natural selection is a slow and gradual process that takes place across multiple generations through successive random hereditary variations. In the short term, a small variation might confer a slight advantage to an organism and its offspring, such as a longer beak or better camouflage, allowing it to…

Read More Read More

How could ancient viruses embedded in our DNA fight cancer?

How could ancient viruses embedded in our DNA fight cancer?

Discover magazine reports: Millions of years ago, our ancestors, like us today, had to contend with viruses. No doubt the infections were unpleasant for them at the time, but their suffering wasn’t for naught — some of those viruses left traces in our DNA. And, according to scientists at the Francis Crick Institute, these remnants may aid the body’s immune response to cancer today. While studying lung cancer in mice and in human tumor samples, the team found that immunotherapy…

Read More Read More

How did birds master flight?

How did birds master flight?

Carl Zimmer writes: In 1993, “Jurassic Park” helped inspire 9-year-old Stephen Brusatte to become a paleontologist. So Dr. Brusatte was thrilled to advise the producers of last year’s “Jurassic World: Dominion” on what scientists had learned about dinosaurs since he was a child. He was especially happy to see one of the most important discoveries make it to the screen: dinosaurs that sported feathers. But judging from the emails he has been receiving, some moviegoers did not share his excitement….

Read More Read More

Time is not an illusion

Time is not an illusion

Sara Walker and Lee Cronin write: A timeless universe is hard to imagine, but not because time is a technically complex or philosophically elusive concept. There is a more structural reason: imagining timelessness requires time to pass. Even when you try to imagine its absence, you sense it moving as your thoughts shift, your heart pumps blood to your brain, and images, sounds and smells move around you. The thing that is time never seems to stop. You may even…

Read More Read More

A chance event one million years ago changed human brains forever

A chance event one million years ago changed human brains forever

Science Alert reports: Like treasured recipes passed down from generation to generation, there are just some regions of DNA that evolution doesn’t dare tweak. Mammals far and wide share a variety of such encoded sequences, for example, which have remained untouched for millions of years. Humans are a strange exception to this club. For some reason, recipes long preserved by our ancient ancestors were suddenly ‘spiced up’ within a short evolutionary period of time. Because we’re the only species in…

Read More Read More

The sleeping beauties of biological evolution

The sleeping beauties of biological evolution

Andreas Wagner writes: What are the most successful organisms on the planet? Some people might think of apex predators like lions and great white sharks. For others, insects or bacteria might come to mind. But few would mention a family of plants that we see around us every day: grasses. Grasses meet at least two criteria for spectacular success. The first is abundance. Grasses cover the North American prairies, the African savannahs and the Eurasian steppes, which span 5,000 miles…

Read More Read More

Imagination makes us human – this unique ability to envision what doesn’t exist has a long evolutionary history

Imagination makes us human – this unique ability to envision what doesn’t exist has a long evolutionary history

Your brain can imagine things that haven’t happened or that don’t even exist. agsandrew/iStock via Getty Images Plus By Andrey Vyshedskiy, Boston University You can easily picture yourself riding a bicycle across the sky even though that’s not something that can actually happen. You can envision yourself doing something you’ve never done before – like water skiing – and maybe even imagine a better way to do it than anyone else. Imagination involves creating a mental image of something that…

Read More Read More

Primitive Asgard cells show life on the brink of complexity

Primitive Asgard cells show life on the brink of complexity

Joshua Sokol writes: An oak tree. The symbiotic fungus intertwined with its roots. A cardinal chirping from one of its branches. Our best clue yet to their shared ancestor might have arrived in electron microscope images that were unveiled in December. “Look!” said the microbiologist Christa Schleper, beaming as she held a printed, high-resolution image in front of her webcam at the University of Vienna. “Isn’t it beautiful?” The cells in the micrograph were 500 nanometer-wide orbs surrounded by a…

Read More Read More

Fossil teeth reveal how brains developed in utero over millions of years of human evolution – new research

Fossil teeth reveal how brains developed in utero over millions of years of human evolution – new research

Any hominid fossil find with molar teeth can be plugged into a new equation that reveals its species’ prenatal growth rate. Gil Cohen-Magen/AFP via Getty Images By Tesla Monson, Western Washington University Fossilized bones help tell the story of what human beings and our predecessors were doing hundreds of thousands of years ago. But how can you learn about important parts of our ancestors’ life cycle – like pregnancy or gestation – that leave no obvious trace in the fossil…

Read More Read More

The Ordovician mass extinction: Our planet’s first brush with death

The Ordovician mass extinction: Our planet’s first brush with death

Cody Cottier writes: Some mass extinctions unfold like a sloppy murder, leaving clear fingerprints for the keen investigator to uncover. (Asteroids are no masters of subtlety.) The Late Ordovician mass extinction, the oldest of all and the second most lethal, isn’t one of them. Though there is a standard explanation for this granddaddy of death — involving an ancient ice age — the evidence is cryptic enough that experts are still submitting new theories for how 85 percent of all…

Read More Read More

The evolutionary importance of slime

The evolutionary importance of slime

Susanne Wedlich writes: The weather in Morro Bay, California is too good, the coastline too picturesque, and the wildlife seem to have waltzed straight out of a Disney film. Sea otters play in the waves with their young, herons bask on the beach, and seals stretch their plump bellies in the sun. And yet amid the tranquility of Morro Bay lurks a monster straight from H.P. Lovecraft’s playbook, as slimy as a creature from Sartre’s nightmares. It doesn’t get much…

Read More Read More

Ancient proteins offer new clues about origin of life on Earth

Ancient proteins offer new clues about origin of life on Earth

Science Daily: By simulating early Earth conditions in the lab, researchers have found that without specific amino acids, ancient proteins would not have known how to evolve into everything alive on the planet today — including plants, animals, and humans. The findings, which detail how amino acids shaped the genetic code of ancient microorganisms, shed light on the mystery of how life began on Earth. “You see the same amino acids in every organism, from humans to bacteria to archaea,…

Read More Read More

Why life is not a thing but a restless manner of being

Why life is not a thing but a restless manner of being

Tim Requarth writes: Mike Russell found his moment of inspiration on a warm spring evening in Glasgow in 1983, when his 11-year-old son broke a new toy. The toy in question was a chemical garden, a small plastic tank in which stalagmite-like tendrils grew out of seed crystals placed in a mineral solution. Although the tendrils appeared solid from the outside, when shattered they revealed their true nature: each one was actually a network of hollow tubes, like bundles of…

Read More Read More

Imagination makes us human – this unique ability to envision what doesn’t exist has a long evolutionary history

Imagination makes us human – this unique ability to envision what doesn’t exist has a long evolutionary history

Your brain can imagine things that haven’t happened or that don’t even exist. agsandrew/iStock via Getty Images Plus By Andrey Vyshedskiy, Boston University You can easily picture yourself riding a bicycle across the sky even though that’s not something that can actually happen. You can envision yourself doing something you’ve never done before – like water skiing – and maybe even imagine a better way to do it than anyone else. Imagination involves creating a mental image of something that…

Read More Read More

Gene expression in neurons solves a brain evolution puzzle

Gene expression in neurons solves a brain evolution puzzle

Allison Whitten writes: The neocortex stands out as a stunning achievement of biological evolution. All mammals have this swath of tissue covering their brain, and the six layers of densely packed neurons within it handle the sophisticated computations and associations that produce cognitive prowess. Since no animals other than mammals have a neocortex, scientists have wondered how such a complex brain region evolved. The brains of reptiles seemed to offer a clue. Not only are reptiles the closest living relatives…

Read More Read More

We can still see these five traces of ancestor species in all human bodies today

We can still see these five traces of ancestor species in all human bodies today

Elia Pellegrini/Unsplash By Alice Clement, Flinders University Many of us are returning to work or school after spending time with relatives over the summer period. Sometimes we can be left wondering how on earth we are related to some of these people with whom we seemingly have nothing in common (especially with a particularly annoying relative). However, in evolutionary terms, we all share ancestors if we go far enough back in time. This means many features in our bodies stretch…

Read More Read More