People seeking a kidney transplant often have to wait years for a donor organ to become available—and many die before ever receiving one. Xenotransplantation, in which organs from one species are transplanted into another, could alleviate the organ shortage. But bridging millions of years of evolutionary divergence between two species is a tall order, so… Continue reading Monkeys with Transplanted Pig Kidneys Live for Up to Two Years or More
Tag: Quantum Stuff
Evolving Bacteria Can Evade Barriers to ‘Peak’ Fitness
For many decades, exploring fitness landscapes was primarily the reserve of theoreticians working with simulated organisms, or pioneering experimentalists working on a relatively small scale. But with the rise of easy, inexpensive gene editing technology, the team behind the new paper wondered if they could build a very large adaptive landscape using living organisms, said… Continue reading Evolving Bacteria Can Evade Barriers to ‘Peak’ Fitness
The New Quest to Control Evolution
Evolution is a complicated thing. Much of modern evolutionary biology seeks to reconcile the seeming randomness of the forces behind the process — how mutations occur, for example — with the fundamental principles that apply across the biosphere. Generations of biologists have hoped to comprehend evolution’s rhyme and reason enough to be able to predict… Continue reading The New Quest to Control Evolution
Key Biden Climate Pollution Metric Is Safe–For Now
CLIMATEWIRE | The Supreme Court on Tuesday declined to take up a fight by Republican-led states over the federal government’s method of estimating the costs of climate change, in a win for President Joe Biden’s push to address rising emissions. In a short, unexplained order, the justices rejected a challenge led by Missouri Attorney General Andrew… Continue reading Key Biden Climate Pollution Metric Is Safe–For Now
A Century Later, New Math Smooths Out General Relativity
Dong and Song proved a conjecture that was formulated in 2001 by the mathematicians Gerhard Huisken and Tom Ilmanen. The conjecture states that as the mass of a space approaches zero, so too must its curvature. Huisken and Ilmanen recognized, however, that this scenario is complicated by the presence of bubbles and spikes (which are… Continue reading A Century Later, New Math Smooths Out General Relativity
Many-Mirrored Galaxies Deepen Dark Matter Mystery
If you’re looking for intergalactic eye candy and cosmic bling, it’s hard to beat Abell 3827, a crowded cluster of hundreds of galaxies about 1.3 billion light-years from Earth. Hubble Space Telescope images of the cluster show a bright central quartet of merging galaxies shimmering like diamonds and perched on an ethereal azure engagement ring.… Continue reading Many-Mirrored Galaxies Deepen Dark Matter Mystery
Your Brain Finds It Easy to Size Up Four Objects But Not Five–Here’s Why
October 11, 2023 3 min read Neuron activity shows that the brain uses different systems for counting up to four, and for five or more By Nature magazine & Mariana Lenharo How many apples? Humans can size up a grouping of four or fewer items in an instant, but larger quantities pose a challenge. For… Continue reading Your Brain Finds It Easy to Size Up Four Objects But Not Five–Here’s Why
NASA Reveals Sneak Peek of Historic Asteroid Sample
October 11, 2023 3 min read OSIRIS-REx’s treasure trove from asteroid Bennu includes material rich in water and carbon By SPACE.com & Mike Wall Accumulated debris from asteroid Bennu covers a portion of the OSIRIS-REx sample collector (middle right). Scientists’ initial analysis of this material shows it contains both carbon and water, two essential ingredients… Continue reading NASA Reveals Sneak Peek of Historic Asteroid Sample
Researchers Refute a Widespread Belief About Online Algorithms
In life, we sometimes have to make decisions without all the information we want; that’s true in computer science, too. This is the realm of online algorithms — which, despite their name, don’t necessarily involve the internet. Instead, these are problem-solving strategies that respond to data as it arrives, without any knowledge of what might… Continue reading Researchers Refute a Widespread Belief About Online Algorithms
In the Gut’s ‘Second Brain,’ Key Agents of Health Emerge
The experiment offered clear evidence that, in addition to other cells, “glial cells can also sense physical forces” through this mechanosensory channel, said Vassilis Pachnis, the head of the nervous system development and homeostasis laboratory at the Francis Crick Institute. Then, having sensed the change in force, they can shift the activity of neural circuits… Continue reading In the Gut’s ‘Second Brain,’ Key Agents of Health Emerge