A TB vaccine may flush Alzheimer's plaques; languages slow brain aging

The gradient that emerged was striking: bilinguals showed brains approximately six years younger than their chronological age; trilinguals, seven; quadrilinguals, an astonishing 13 years younger [80]. Alongside that finding, scientists at Baylor College of Medicine recorded activity from individual neurons in four bilingual epilepsy patients who already had electrodes implanted in their hippocampi. Individual neurons often preferred one language, but the brain's underlying concept map was shared: "dog" and "wolf" clustered near each other in both English and Spanish, and the team could use the English concept map alone to accurately predict where related Spanish words would fall [203]. "It's like looking into a room from a different window," said study author Sameer Sheth. "Everything inside is the same, but the perspective is different."

Their method was blunt but effective. Because mice cohabiting with other mice naturally consume feces, young and old animals housed together exchange gut bacteria within weeks. Within one month of living with aged mice, young animals forgot objects they had just explored. On a Barnes maze, they struggled with spatial navigation. They behaved like animals far older than they were. The suspected route was the vagus nerve, the long communication highway running from the abdomen to the base of the brain: aged gut bacteria appeared to dampen its signaling. When the researchers restored normal gut-to-brain communication along that pathway, memory returned.

In their new study, they tracked healthy older adults for 12 months and confirmed for the first time in humans that BCG's immune-remodeling effects can cross the blood-brain barrier into the cerebrospinal fluid. In adults with no pre-existing Alzheimer's pathology, the vaccine appeared to shift the balance of amyloid-beta, the protein whose accumulation is central to Alzheimer's disease: levels fell in the cerebrospinal fluid while rising in the bloodstream, as though the vaccine helped push the protein out of the central nervous system. Immune cells in the brain became more responsive without becoming more inflammatory, a critical distinction since chronic neuroinflammation is itself a driver of brain damage. In participants who already had established Alzheimer's biomarkers, the protective shift vanished entirely [81].

Over five years, those prescribed GLP-1 receptor agonists like semaglutide showed a 48% lower risk of major amputation, a 37% lower risk of minor amputation, and a 36% lower risk of needing procedures to surgically restore circulation. They were also 26% less likely to die from any cause. PAD already makes walking to a mailbox a genuine challenge for the people it affects most. Amputation, for those whose disease progresses that far, changes everything about daily life.

Both species hunted the same four animals, wild goats, fallow deer, roe deer, and wild boar. Both sourced their flint from the same local deposits. Both carried small marine snails, Columbella rustica, into the cave not for food but seemingly as ornaments; some were pierced as if meant to be strung. One shell from the Neanderthal layers showed signs of deliberate heating to alter its color. Researchers distinguished the two species from fossilized teeth and dated the sediment using optically stimulated luminescence, a technique that reveals when buried mineral grains last saw sunlight. The Neanderthals occupied the site roughly 77,000 to 59,000 years ago; modern humans followed from 59,000 to 47,000 years ago. Published in PNAS, the study describes "a deep level of cultural interaction," in the words of co-author Naoki Morimoto of Kyoto University [4].

Standard treatment for severe facial burns is skin grafting: it works, but grafted skin doesn't match surrounding tissue and leaves visible, patch-like scarring. For a young person's face, that's a hard outcome to accept. Her surgeon, Dr. Marc Jeschke, had studied exosomes, the tiny particles cells release to coordinate healing and manage inflammation, in burn research for years, but had never been able to apply them to a burn patient. He applied to Health Canada for compassionate use authorization and received no objection. Over several days, Jeffrey underwent two treatments using one trillion exosomes sourced from lab-grown cells. She healed faster, with better cosmetic outcomes than a comparison patient from the same fire whose burns, while serious, didn't qualify for the treatment. "It's honestly a miracle," Jeffrey said [247].

China's decade-long push to scale solar manufacturing had dropped panel prices far enough that a Pakistani household could buy their way out of grid dependence in a single upfront investment. They did, in enormous numbers. By early 2026, rooftop solar was supplying roughly one-fifth of Pakistan's total national power and had helped the country avoid approximately $12 billion in oil and gas imports. When the US struck Iran and oil climbed past $100 a barrel, effectively ending LNG shipments, Pakistan's distributed solar network absorbed much of the shock. "Pakistan serves as a great case study as to how renewables can provide a hedge against dependence on fossil fuels," said energy finance specialist Haneea Isaad [226].