Welcome to Peer Review'd, where we break down the latest science news into digestible, fascinating stories. I'm your host, and today we're wrapping up 2025 with some truly remarkable discoveries that span from the depths of time to the frontiers of medicine, and even a few that might make you rethink your next gym session.

Let's start with something that's been making headlines in the cannabis research world. For years, people have turned to cannabis for chronic pain relief, but what does the science actually say? A new comprehensive review of multiple clinical trials has found that cannabis products with higher THC levels may provide slight relief for chronic pain, particularly nerve pain. But here's the catch—the improvement was small and short-lived, while side effects were notably more common. And if you've been considering CBD-only products? The research showed no clear benefit from formulations with little or no THC. It's a reminder that while cannabis may offer some relief, it's not the miracle cure some have hoped for, and researchers are calling for more long-term studies to really understand its potential and limitations.

Speaking of medical treatments, let's talk about weight loss. With drugs like Ozempic and Wegovy dominating headlines, you might think we've found the ultimate solution. But new research suggests that metabolic and bariatric surgery remains significantly more effective. After two years, people who undergo these surgical procedures achieve weight loss about five times greater than those using non-surgical approaches, including the popular semaglutide and tirzepatide medications. This doesn't diminish the value of these drugs—they've been transformative for many people—but it highlights that for severe obesity, surgery may still be the most effective intervention we have.

Now, here's a study that might change how you approach your next workout. Research published by the American Psychological Association found that swearing during physical challenges isn't just blowing off steam—it might actually make you stronger. People who let loose with profanity during strenuous activities could push themselves harder and last longer. The researchers believe swearing lowers inhibitions, increases confidence, and helps people enter that coveted flow state. So the next time you're struggling through that last rep, don't feel bad about letting a few choice words fly. Science says it might be helping.

Let's journey back billions of years now. Ancient rocks in Australia, dated to three-point-seven billion years old, are rewriting our understanding of Earth's first continents. By studying feldspar crystals preserved in Australia's oldest magmatic rocks, scientists are gaining new insights into the early evolution of Earth's mantle and continents. The research suggests that our planet's continents formed later than previously thought and may share a common origin with the Moon. It's remarkable to think these rocks have been quietly holding secrets about our planet's infancy for nearly four billion years.

In molecular biology, scientists have just corrected a decades-old misunderstanding. What researchers long believed were knots in DNA may actually be persistent twists formed during nanopore analysis. Nanopore experiments are widely used to study genetic material, and for years, complex electrical patterns were interpreted as signs that DNA was forming knots. This discovery reveals an overlooked mechanism with major implications for how we understand DNA structure and could impact everything from genetic sequencing to our basic understanding of molecular biology.

On the virus front, there's exciting news that could lead to broad-spectrum antiviral treatments. Researchers at the University of Maryland, Baltimore County have identified a shared RNA-protein interaction in enteroviruses—a family that includes viruses responsible for polio, encephalitis, myocarditis, and the common cold. By understanding how these viruses begin reproducing inside human cells, scientists may be able to develop a universal antiviral drug. Imagine having one treatment that works against multiple viral threats. It's the kind of breakthrough that could transform medicine.

Here's a fascinating study about evolution itself. Scientists ran large-scale computer simulations to essentially replay evolution under different conditions, and they found something surprising: environmental change doesn't affect evolution in a single, predictable way. Some fluctuating conditions help populations evolve higher fitness, while others slow or even derail progress. Two populations facing different kinds of change can end up on completely different evolutionary paths. This challenges the idea that one population's response can represent an entire species, adding beautiful complexity to our understanding of how life adapts.

In cancer research, scientists have discovered that breast cancer can disrupt the brain's daily stress hormone rhythms early in disease development. This finding may explain why cancer patients often experience anxiety, insomnia, and cognitive difficulties. As one researcher noted, the brain is an exquisite sensor of what's happening in your body, but it requires balance. Neurons need to be active or inactive at the right times. This research opens new avenues for treating the neurological symptoms that accompany cancer, potentially improving quality of life for millions of patients.

Let's travel to the Arctic now, where fossils on the island of Spitsbergen are revealing a spectacular story. After Earth's worst extinction event, marine life made a stunning comeback—much faster than anyone expected. Tens of thousands of fossils show that fully aquatic reptiles and complex food chains were thriving just three million years after the catastrophe. Some predators grew over five meters long. This challenges the prevailing idea of a slow, gradual recovery and rewrites the early history of ocean ecosystems. Life, it seems, is more resilient than we give it credit for.

COVID-19 continues to reveal its long-term effects. Advanced imaging studies show that the virus may cause lasting brain changes, even in people without ongoing symptoms and who have fully recovered from the infection. This points to hidden neurological effects that could persist long after recovery. It's a sobering reminder that this virus affects more than just the lungs and highlights the importance of continued research into long COVID and its neurological impacts.

In particle physics, the hunt for the sterile neutrino has taken an interesting turn. Neutrinos are nearly invisible particles that play a starring role in the universe. Long-standing anomalies had hinted at a mysterious fourth type—a sterile neutrino—that could potentially rewrite the laws of physics. But the KATRIN experiment, using exquisitely precise measurements of tritium decay, found no evidence for such a particle, sharply contradicting earlier claims. However, with more data and upgrades ahead, the hunt is far from over. Sometimes negative results are just as important as positive ones in narrowing down the truth.

Here's something straight out of science fiction that's now science fact: time runs faster on Mars than on Earth. Thanks to Einstein's relativity, NIST scientists have precisely measured this difference, showing that Mars clocks tick slightly faster and fluctuate over the Martian year. These microsecond shifts could play a big role in future Mars navigation, communications, and even a solar-system-wide internet. It's a small time gap with potentially huge consequences for space exploration.

Back to medicine, there's promising news in cancer treatment. Scientists have engineered a special antibody that significantly enhances a group of medications called CD40 agonist antibodies. For two decades, these drugs have shown promise in laboratory animals, strongly stimulating immune attacks on tumors, but they've struggled to deliver results in humans. This new experimental approach made tumors vanish without the dangerous side effects that have plagued previous attempts. It's early days, but this could represent a major breakthrough in immunotherapy.

In sustainability science, researchers are discovering that food waste—often seen as nothing more than compost material—holds remarkable potential. From dried beet pulp to coconut husks, discarded food can be transformed into valuable compounds for healthier crops, stronger ecosystems, and even new medical applications. It's a beautiful example of how waste in one system can be treasure in another.

Quantum physics has given us another mind-bending discovery. Researchers at TU Wien have developed a one-dimensional quantum wire using ultracold atoms where both mass and energy can move freely without friction or energy loss. This system refuses to follow the rules of classical physics, existing in a quantum realm where the normal limitations of transport simply don't apply. It's fundamental research that could one day lead to revolutionary technologies.

And finally, let's talk about our ancient cousins. A new study has linked climate change to the disappearance of Homo floresiensis, the so-called hobbits of Flores. These small-statured early humans, who stood about three and a half feet tall, disappeared around fifty thousand years ago, and researchers have now found strong evidence that climate stress played a crucial role in their extinction. It's a poignant reminder that climate change has shaped human evolution throughout our history, and that even successful species can be vulnerable to rapid environmental shifts.

That's all for today's episode of Peer Review'd. From the molecular to the cosmic, from ancient extinctions to future medicines, science continues to surprise us, challenge us, and expand our understanding of the universe and our place in it. Until next time, stay curious.