Today's science dispatches span 25,000 years of human behavior, the frontiers of cancer treatment, and the strange physics of materials thinner than a soap bubble. We've got ancient teeth hiding secrets about prehistoric drug use, a UCLA breakthrough that leaves tumors with nowhere to hide, and a surprising new look at whether a familiar diabetes medication could be humanity's next anti-aging tool. Buckle up - the universe has been busy.

Long before written history, before agriculture, before cities - humans were apparently already experimenting with mind-altering substances. New research has uncovered evidence of psychoactive drug use 25,000 years ago, preserved in ancient dental remains. The findings push back the known timeline of intentional drug consumption by a remarkable margin.

Teeth are extraordinary time capsules. Dental calculus - the hardened plaque that builds up over a lifetime - can trap chemical residues from everything a person consumed. By analyzing these ancient deposits, scientists were able to identify the chemical signatures of substances that would have had psychoactive effects on the brain.

This discovery reshapes our understanding of early human cognition and ritual behavior. The deliberate use of psychoactive plants this early suggests a level of botanical knowledge and intentionality that demands we reconsider just how sophisticated our ancient ancestors truly were.

One of cancer's most frustrating tricks is its ability to evolve and slip past the immune system's defenses. Now, UCLA scientists have developed a new class of cancer-fighting cells specifically engineered to make that escape far more difficult. The research represents a meaningful step forward in the long-running effort to harness the immune system against tumors.

Traditional immunotherapies can be outmaneuvered when tumors mutate and lose the surface markers that immune cells use to recognize them. This new approach appears to address that vulnerability directly, creating cells that can track and target tumors through multiple pathways simultaneously - reducing the odds that any single mutation will let a cancer cell go undetected.

Cancer's adaptability has long been its greatest weapon. A therapy that can stay one step ahead of tumor evolution could dramatically change outcomes for patients whose cancers have previously evaded treatment - and UCLA's work brings that future measurably closer.

Metformin has been prescribed for type 2 diabetes for decades, but researchers have long noticed something curious: patients taking it seem to age in subtly different ways than those who don't. Now scientists are taking a serious, structured look at whether this inexpensive, widely available drug could genuinely slow the biological aging process in the broader population.

The distinction between chronological age - the number of candles on your birthday cake - and biological age - how old your cells and tissues actually behave - is at the heart of this research. If metformin can shift biological aging even modestly, the downstream effects on disease risk, cognitive health, and quality of life could be profound.

An anti-aging drug that already exists in pharmacies worldwide, costs pennies per dose, and has a decades-long safety record would be a remarkable find. The research is still developing, but the question being asked is one of the most consequential in modern medicine.

When you reduce a material to just a few atoms of thickness, the ordinary rules of physics start to bend. Scientists have now discovered that one such ultra-thin material is displaying magnetic properties that don't fit existing theoretical models - a finding that's both puzzling and exciting for the physics community.

Two-dimensional materials - those thin enough that quantum effects dominate their behavior - have been a hotbed of discovery since graphene first stunned the world. This new finding suggests there are still entirely unexpected behaviors hiding in these ultra-thin systems, waiting to be understood and potentially harnessed for next-generation electronics, sensors, or data storage.

Strange magnetism in a material this thin isn't just a curiosity - it's a signal that our models of matter at the quantum scale remain incomplete. Every unexpected discovery like this one is a door opened onto new technology we haven't yet imagined.

The Black Death of the 14th century killed tens of millions - but it was not plague's first appearance on the human stage, not by a long shot. New research reveals that Yersinia pestis, the bacterium responsible for plague, was devastating families and communities thousands of years earlier than previously documented, reshaping our understanding of prehistoric mortality.

By analyzing ancient DNA from burial sites, researchers were able to trace the pathogen's presence deep into prehistory. The evidence suggests plague wasn't a medieval aberration - it was a recurring killer that shaped human population dynamics long before anyone had a name for it or any means to understand what was happening.

Understanding plague's ancient history isn't just a matter of historical curiosity. Knowing how pathogens have evolved over millennia - and how human populations have responded - gives epidemiologists and public health researchers critical insight into how infectious diseases behave over long timescales.

There's something both humbling and thrilling about the idea that a concept taught in chemistry classrooms for nearly a century turns out to be incorrect. New research has identified exactly that: a fundamental chemical principle that textbooks have been misrepresenting for close to 100 years, and the correction has implications that ripple through both education and applied science.

The finding serves as a vivid reminder that science is a living, self-correcting enterprise. Even ideas that have been repeated so many times they feel like settled fact are subject to revision when new experimental evidence or theoretical analysis demands it. This correction, once integrated into teaching and research, could shift how chemists approach problems that depend on this foundational concept.

Science's greatest strength is its willingness to be wrong - and then to fix it. A century-old error being caught and corrected today is not a failure of chemistry; it's a triumph of the scientific method doing exactly what it's supposed to do.

From teeth that remember what people consumed 25,000 years ago, to materials thin enough to bend the laws of physics, to a drug that might make your cells forget how old they are - today's science is a reminder that the universe is still full of surprises. The best discoveries are the ones that make us realize how much we still don't know. We'll be back with more tomorrow.