Science & TechnologyS


Radar

Aquaterra: Rising seas swallowed countless archaeological sites

sea level rise history map
© Deep Time Maps/Alison Mackey/DiscoverFrom Doggerland to Beringia, the sea took some of prehistory's most important archaeological sites. All over the world, scientists are beginning to find them again.
Whatever you learned in school about how our species spread across the planet is wrong.

For decades, textbooks taught that humans left our ancestral African homeland and spread across the world via the landmasses we know today, reaching Australia less than 50,000 years ago and the Americas a mere 13,500 years ago. But there's a continent-sized gap in our knowledge about our collective past that scientists are only now starting to fill in.

From the North Sea to the island-dotted tropics between Asia and Australia, from the frigid waters of the Bering Strait to the sunny Arabian Peninsula, now-submerged coastal landscapes were exposed and accessible to our ancestors at multiple times in prehistory, including key periods of human expansion across the globe. The square mileage of these areas now under the seas is equal to that of modern North America.

"My own view is that there are certainly sites out there," says University of York archaeologist Geoff Bailey. "Some of the areas [that would have been] most attractive to humans are now underwater."

Microscope 2

"Genes Out of Nothing"? Two Studies Demonstrate the Power of Mind

foldit
Screenshot of the game FoldIt
Two recent experiments highlight the power of mind to direct natural processes against astronomical improbabilities. One study boasts of getting "New genes out of nothing." (The echo of Lawrence Krauss's book A Universe from Nothing is noteworthy.) The other study shows what human minds can do with protein precursors (the translated products of genes) by using "design selection" as opposed to natural selection.

The Challenge

In the "genes out of nothing" camp, researchers at Uppsala University describe the challenge they face - and that standard Darwinian processes had to face:
How do new genes and functional proteins arise and develop? This is one of the most fundamental issues in evolutionary biology. Two different types of mechanism have been proposed: (1) new genes with novel functions arise from existing genes, and (2) new genes and proteins evolve from random DNA sequences with no similarity to existing genes and proteins. In the present study, the researchers explored the latter type of mechanism: evolution of new genes and proteins from randomised DNA sequences - de novo evolution, as it is called. It is fairly easy to understand that when a gene already exists, it can be modified and acquire a new function. But how does "nothing" turn into a function affording a small advantage that is favoured by natural selection? [Emphasis added.]
Upon reading this news, however, one finds another case of artificial selection. True, they started with 500 million randomized sequences, but the scientists selected the goal: finding polypeptides able to confer antibiotic resistance. While they were delighted to see successes out of their sample, their experiment had nothing to do with natural selection. Even worse, they only tested short polypeptides 22-25 amino acid residues long. The sequence space rises exponentially with polypeptide length, ensuring that even small proteins of 100 aa would be vastly outnumbered by useless ones.

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Translation of genes more complex than expected

dna in cell
© Juan Gärtner / Adobe Stock
Researchers from the group of Marvin Tanenbaum at the Hubrecht Institute have shown that translation of the genetic information stored in our DNA is much more complex than previously thought. This discovery was made by developing a type of advanced microscopy that directly visualizes the translation of the genetic code in a living cell. Their study is published in the scientific journal Cell on June 6th.

From gene to protein

Each cell in our body contains the same DNA, yet different cells, like brain cells or muscle cells, have different functions. The differences in cell function depend on which parts of the genetic information (called genes) are active in each cell. The genetic information stored in these genes is translated by specialized translation factories called ribosomes. Ribosomes read the genetic code and assemble proteins based on the information stored in this genetic code analogous to a factory building a machine based on a blueprint. Proteins are the workhorses of our body and perform the functions encoded in our genes. For our cells and organs to function correctly, it is critical that the genetic information stored in our genes is translated accurately to proteins. If the genetic code is translated incorrectly, harmful proteins can be produced, which can lead to neurological diseases such as Huntington's disease.

Beaker

What could go wrong department: Fungus genetically engineered to produce spider venom that kills mosquitoes

GMO fungus kills mosquitos
© Brian LovettAn Anopheles gambiae mosquito with our transgenic fungus emerging from its body after death. This is a merged version of a natural light image and a green fluorescent image.
A new weapon in the war against malaria-carrying mosquitoes has arrived just in time for summer.

Researchers from the University of Maryland and the Research Institute of Health Sciences in Burkina Faso have figured out a way to genetically alter a fungus to produce deadly spider venom that kills mosquitoes.

The fungus, known as Metarhizium pinghaense, which is already deadly to mosquitoes even without the added venom, works so well that in one trial, it nearly killed off an entire population of the pest in 45 days.

"We are using a gene encoding a single toxin, one of the many toxins in spider venom," Dr. Raymond St. Leger of UMD Entomology told Fox News.

"The toxin has been thoroughly characterized by our Australian collaborator Glenn King and approved for use as an insecticide by the EPA, so this toxin has been confirmed to be safe for everything but insects."


Comment: More on the 'war on mosquitoes' and genetic engineering:


Bizarro Earth

Scientists find the weirdest magma on the planet below Bermuda

Bermuda draws in over 650,000 tourists each year with its luxurious pink sand beaches, clear blue waters, and thriving local art scene. Sitting just below the surface, however, lies a volatile history: The island is actually an ancient volcano. While we're not concerned of any future eruptions, the compositions of these volcanic rocks could provide key information about how volcanoes form, and what its like deep inside the earth. New research from a team of geoscientists suggests the magma that fueled this volcano formed in a rather odd place.
Magma
© Jenny Marvin (via Unsplash)
Over 30 million years ago, the island of Bermuda would have looked a bit different-where sunburnt tourists now sit sipping piña coladas, there may have been a hot, coursing river of lava. No humans were harmed during this volcanic episode, although that's mainly because humans did not exist yet (existing animals may not have been so lucky). While little evidence of this is exposed on the island's limestone surface, scientists can drill below to access Bermuda's deep volcanic history.

Back in the 70s, geologists from Dalhousie University and the Lamont-Doherty Earth Observatory drilled a hole into the Bermuda platform over 2,600 feet deep, extracting tons of cylindrical volcanic rock samples. A few studies looked at these rocks, but since then, the core has been mostly collecting dust in a basement in Halifax, waiting for someone to stumble across it again.

Decades later, Sarah Mazza, a volcanologist at the University of Münster, noticed something peculiar while looking at these rocks under a microscope.

"I first suspected that Bermuda's volcanic past was special as I sampled the core and noticed the diverse textures and mineralogy preserved in the different lava flows," said Mazza.

Microscope 1

Gene study suggests T. rex had an amazing sense of smell

Tyrannosaurus rex, dinosaur
© Reuters / Charles PlatiauTyrannosaurus rex kely had a sense of smell only slightly less powerful than that of a modern house cat.
Fresh analysis of modern genes and ancient brains backs up the notion that the meat-eating dinosaur had an especially powerful nose.

Talk about inhaling your food: The iconic predator Tyrannosaurus rex and its kin had some of the keenest senses of smell among all extinct dinosaurs, a new study finds. The work, published yesterday in Proceedings of the Royal Society B, attempts to roughly quantify how many genes would have been involved in T. rex's sniffing skills, tens of millions of years after any traces of its DNA have decayed away.

The idea that tyrannosaurs had good noses is not new. In 2008, for instance, researchers showed that T. rex and its siblings devoted large portions of their brains to processing smell. But the new study marks the latest in a growing movement to correlate living animals' DNA with their bodies and sensory abilities, with the goal of better understanding the capabilities and behaviors of their long-extinct relatives.

Snowflake Cold

Researchers gathering clues to mysterious, gaping holes in Antarctic ice

polynas
© NASAThe Maud Rise Polynya that appeared in the Weddell Sea in 2017 is larger than the state of Maryland
Enormous holes piercing the Antarctic winter ice pack have popped up sporadically since the 1970s, leaving scientists scratching their heads.

Scientists may have finally found an explanation for the enormous holes appearing in the Antarctic winter ice pack since about four decades ago.

With the help of floating robots and tech-equipped seals, they seem to be close to shedding light on the mysterious phenomena, the so-called polynyas (Russian for "open water"), that seem to be the result of storms and salt, new research published on 10 June in the Nature journal says.

Comment: Massive hole in Antarctica's ice appears after 40 years


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New discovery about origins of multi-celled animals 'turns core theory of evolutionary biology on its head'

microscopic life
Scientists at The University of Queensland have upended biologists' century-old understanding of the evolutionary history of animals.

Using new technology to investigate how multi-celled animals developed, their findings revealed a surprising truth.

Professor Bernie Degnan said the results contradicted years of tradition.

"We've found that the first multicellular animals probably weren't like the modern-day sponge cells, but were more like a collection of convertible cells," Professor Degnan said.

Comment: In other words, these ancient multicellular animals were organized with much greater complex than predicted by evolutionary biologists. This finding sounds much more in line with Intelligent Design than Darwinian evolution.


Satellite

India sets sights on its own space station around 2030

earth
© Global Look Press / NASA
Not content with just sending astronauts into the cosmos, India is also planning an ambitious project to develop and launch its own space station, the head of its space agency has announced.

Dr Kailasavadivoo Sivan, Chairman of Indian Space Research Organisation (ISRO), told reporters on Thursday that the effort will be an extension of its Gaganyaan mission, which aims to blast New Delhi's first ever astronauts into orbit by August 2022.

"We have to sustain the Gaganyaan program after the launch of the human space mission," Sivan said. In this context, India is planning to have its own space station.

A detailed plan for the station will be submitted to the administration of prime minister Narendra Modi. It is expected that, following the Gaganyaan mission, the proposed installation will be put into orbit around 2030.

Eye 1

Samsung deepfake AI could fabricate a video of you from a single profile pic

face
Imagine someone creating a deepfake video of you simply by stealing your Facebook profile pic. The bad guys don't have their hands on that tech yet, but Samsung has figured out how to make it happen.

Software for creating deepfakes -- fabricated clips that make people appear to do or say things they never did -- usually requires big data sets of images in order to create a realistic forgery. Now Samsung has developed a new artificial intelligence system that can generate a fake clip by feeding it as little as one photo.

The technology, of course, can be used for fun, like bringing a classic portrait to life. The Mona Lisa, which exists solely as a single still image, is animated in three different clips to demonstrate the new technology. A Samsung artificial intelligence lab in Russia developed the technology, which was detailed in a paper earlier this week.