Evolution

Using molecular evidence buried in rocks, researchers at MIT suggest that some of the Earth’s first living creatures are ancestors of the modern sea sponge, reports Ashley Fike for Vice. “The discovery suggests the earliest animals were simple, filter-feeding organisms that slowly cleaned the seas while the rest of the evolution was still figuring itself out,” says Fike. “These early sponges likely had no skeletons, nerves, or eyes – just porous bodies that absorbed water and nutrients. Yet they paved the way for everything that came next, from insects to mammals to us.” 

A new study by MIT researchers suggests sea sponges may have been the “first animals to inhabit the Earth,” reports Maria Azzura Volpe for Newsweek. “In their work, the researchers linked so-called ‘chemical fossils’ found in ancient rocks to the ancestors of a class of modern-day sea sponges known as demosponges,” explains Volpe. “These chemical fossils—the molecular remnants of once-living organisms that have been buried, transformed, and preserved in sediment over time—were discovered in rocks that date back to more than 541 million years ago, during the Ediacaran Period.” 

MIT researchers have uncovered new evidence that suggests some of Earth’s first living creatures are ancestors of the modern sea sponge, reports Andrew Paul for Popular Science. The researchers identified 541 million-year-old chemical fossils embedded in sediment that they believe may indicate that some of Earth’s earliest creatures were the ancient relatives of today’s sea sponges. 

Prof. Alan Lightman speaks with Boston Globe correspondent Kate Tuttle about his new book, “The Miraculous from the Material: Understanding the Wonders of Nature,” in which Lightman “celebrates the phenomena that inspire awe.” Lightman explains: “I think the humanities are even more important now in a period of exponentially advancing technology. We really have to think hard about what makes us human. Like having compassion for other people. The ability to fall in love, the ability to appreciate beauty.”

Researchers at MIT and elsewhere have found a “unique atomic-level interaction that shields collagen from the damaging effects of water molecules,” reports Mrigakshi Dixit for Interesting Engineering. “Proteins deteriorate when the peptide bonds that link the component amino acids are attacked by water molecules, which results in the cleavage of the peptide bonds,” explains Prof. Ronald Raines. “We discovered a chemical interaction in collagen that protects its peptide bonds from attack and cleavage.” 

A new study by MIT scientists uncovers how male sandgrouse are able to soak up large amounts of water in their feathers and carry it over long distances to their chicks, reports Forbes. The researchers found that “when wetted, the coiled portions of the sandgrouse feather barbules unwind and rotate so they end up perpendicular to the vane. This creates a dense forest of fibers that can hold water through capillary action.”

Forbes contributor David Bressan writes that a new study by MIT researchers proposes that oxygen began accumulating in early Earth’s atmosphere due to interactions between marine microbes and minerals in ocean sediments. The researchers hypothesize that “these interactions helped prevent oxygen from being consumed, setting off a self-amplifying process where more and more oxygen was made available to accumulate in the atmosphere,” writes Bressan.

HuffPost reporter Mary Papenfuss writes that a team of archeologists and scientists, including Research Scientist Jahandar Ramezani, have uncovered evidence of social behaviors in dinosaurs. “The bones were segregated by age, with eggs in a common nesting ground,” writes Papenfuss. “Juveniles likely were left in ‘schools’ while adults foraged.”

Research scientist Jahandar Ramezani speaks with Scientific American reporter Christopher Intagliata about his new study that provides evidence early dinosaurs exhibited herding behavior. “This is a critical time in the evolution of dinosaurs. This is pretty early on,” says Ramezani. “So the idea is: this type of behavior, this social behavior, may have actually contributed to the evolutionary success of dinosaurs.”

Researchers from MIT and other institutions have uncovered evidence that early dinosaurs may have lived in social herds, reports Kate Baggaley for Popular Science. “People have known for a long time that the more advanced dinosaurs, the ones that lived in the late Jurassic and Cretaceous, especially the large sauropods…moved and lived in herds,” explains research scientist Jahandar Ramezani. “But the question has always been, when did this behavior start?”

A new study by MIT researchers finds that there are differences in how genes are used in men and women, reports Angus Chen for WBUR. “I think we are at present missing a lot because we operate with what is essentially a unisex model in biomedical research,” explains Prof. David Page.

A new study by MIT researchers provides evidence that life on Earth may have begun in shallow bodies of water, reports Martin Finucane for The Boston Globe. The researchers found that ponds “could have held high concentrations of a key ingredient, nitrogen, while that would have been less likely in the ocean,” Finucane explains.

A new study by MIT researchers provides evidence that the first life on Earth likely came from shallow ponds, not oceans, reports the Xinhua news agency. The researchers found that primitive ponds that were about “10 centimeters deep had higher concentrations of nitrogen, a key ingredient for life on Earth.”

Postdoc Gabriel Leventhal has created a project to track how the microbes in a sourdough starter change as it gets shared around the world, writes Alex Kingsbury of The Boston Globe. To track the starter, “Herman,” each descendant is given a unique name and number before the samples are returned to the lab to track how the microbes evolve, Kingsbury explains.

New research from members of the Broad Institute finds that ancient and present elephant species are the product of interbreeding. The team will now “explore how (and if) the intermingling of genetic traits may have been advantageous for elephant evolution, like an increased tolerance for new habitats and climate change,” writes George Dvorsky for Gizmodo.