Science and facts

A liquid painted onto teeth in just seconds halted tooth decay in a large US trial. The liquid is silver diamine fluoride. A dentist applies it to a decayed tooth with a tiny sponge, and the whole process takes only a few seconds. The silver works against the bacteria that cause decay, while the fluoride strengthens the remaining tooth structure. The trial was led by the University of Michigan and New York University, with study sites in Michigan, New York, and Iowa. Researchers treated 830 children under the age of 6 who had severe tooth decay. With applications every six months, the treatment stopped the decay in more than half of the affected teeth. This matters because drilling and filling very small teeth often requires sedation or even general anesthesia, and many families cannot access that kind of care at all. Lead researcher Margherita Fontana says the treatment is both highly effective and safe, even for children as young as 1. There is one drawback that parents will notice: the treated area turns permanently black. The FDA has already cleared the liquid for treating tooth sensitivity, and the researchers say these results support approving it for stopping cavities as well. [Fontana M, Moursi A, Gonzalez-Cabezas C, et al. Efficacy of silver diamine fluoride on young children with severe early childhood caries: a randomized clinical trial. JAMA Pediatrics. 2026. DOI: 10.1001/jamapediatrics.2026.2567] Science and facts💡

A single hail storm in Damon, Texas, destroys THOUSANDS of acres of solar panels. Is it really wise to make ourselves dependent on expensive energy infrastructure that can be rendered permanently useless by one night of bad weather? https://www.irena.org/publications/2016/Jun/End-of-life-management-Solar-Photovoltaic-Panels Science and facts💡

A simple way to understand wave motion Science and facts💡

In central Mexico, there's a green, grassy hill with a little colonial church perched on top — and almost no one walking past realizes they're looking at the largest pyramid on Earth. ⛰ This is the Great Pyramid of Cholula, and by sheer volume it's bigger than the Great Pyramid of Giza — holding nearly twice as much material inside. It was built and rebuilt outward over roughly a thousand years, layer upon layer, by one culture after another. But it was abandoned long before the Spanish ever arrived, and slowly vanished beneath centuries of soil and plants until it simply looked like a natural hill — so when the conquistadors raised their church on the summit, they may not have even known what was buried underneath. Archaeologists have since bored almost five miles of tunnels straight through it, discovering older pyramids sealed inside newer ones like nesting dolls. Yet it has never been fully excavated — because uncovering one version would destroy another. Science and facts💡

NASA’s Voyager 1, the most distant human-made object, briefly went quiet this month before reconnecting on its own. On Oct. 18 and 19, the giant dish antennas of NASA’s Deep Space Network failed to pick up the probe’s radio signal during two scheduled check-ins. The signal returned on Oct. 20, before engineers had sent any commands. Early clues show that one set of thrusters shut down and backups took over automatically. This built-in safety response, called fault protection, puts the spacecraft in a stable state while engineers figure out what went wrong. The exact cause is still under investigation. In September, engineers replaced three heating devices with lower-power versions all at once, a move nicknamed the “Big Bang.” Voyager runs on heat from decaying plutonium and loses about 4 watts of power each year. Without the swap, another science instrument might have been shut off by summer 2027. Science and facts💡

Each sunflower's head is made of smaller flowers. The disc florets in the middle, where the seeds develop, have both male and female sex organs, and each produce a seed. Bonus: these mini-flowers pattern contains many Fibonacci spirals. Science and facts💡

No engineer survived the sinking of the Titanic. When the RMS Titanic struck an iceberg on the night of April 14, 1912, Chief Engineer Joseph Bell and his team of 35 men, engineers, electricians, boilermakers, and a plumber, made a quiet but heroic decision: they stayed at their posts deep in the ship’s engine and boiler rooms. As freezing seawater poured in, they kept the steam engines running, the pumps operating, and the lights burning brightly across the entire vessel. Their grueling work bought precious extra time — keeping the wireless operators powered so they could continue sending distress signals, and delaying the final plunge into darkness. None of them made it out alive. Because every single member of the engineering department perished, their extraordinary sacrifice has often been overlooked in the vast retellings of the disaster. There were no survivors from their ranks to describe the rising water, the failing systems, or the calm determination with which they worked until the end. They didn’t fight for their own lives. They fought to give everyone else a better chance. Their courage ensured that the Titanic did not sink in total blackness. The lights stayed on, the pumps kept working, and hundreds more passengers had those critical extra minutes to reach the lifeboats. Science and facts💡

In 2018, a helicopter pilot flying over the mountains of British Columbia spotted something that shouldn't exist — a massive hole punched into the snow, with an entire river pouring straight into it and vanishing. Hidden deep in Wells Gray Provincial Park, the pit is roughly 330 feet long and 200 feet wide at the top. When a team of experts finally lowered a climber inside, he descended about 260 feet down the sheer wall before the crashing waterfall forced him to stop. A laser then measured at least 443 feet down the slope — and still never found a floor. The mist thrown up by the falling water hides everything below, so to this day no one actually knows how deep it goes. Locals nicknamed it "Sarlacc's Pit" after the monster from Star Wars. Old aerial photos going back to 1949 hint the hole was once sealed by snow even in summer, meaning it may have only recently opened up. Scientists suspect the swallowed river resurfaces at a spring more than a mile away — but no one has ever proven where the water actually goes. The site is now closed to the public to keep people safe. Science and facts💡

The administrative burden on modern healthcare is breaking the doctor-patient relationship. For every single hour a physician spends providing patient care, they must log two hours of paperwork. Research tracking U.S. doctors throughout their workdays shows that only 27% of their time is dedicated to direct patient interaction. Nearly 50% of the day goes into electronic health records and billing protocols. The screen time doesn't stop at the exam room door either—doctors spend over a third of their appointments looking at monitors, and frequently finish documentation at home. This hidden, relentless desk work is the primary reason medical appointments feel rushed and why 4 in 10 physicians report burning out. While this squeeze has persisted for a decade, hospitals are finally exploring a tech-driven lifeline: deploying AI note-taking tools and digital medical scribes to take the paperwork off the doctor's plate. [Sinsky, C., Colligan, L., Li, L., Prgomet, M., Reynolds, S., Goeders, L., Westbrook, J., Tutty, M., & Blike, G. Allocation of physician time in ambulatory practice: A time and motion study in 4 specialties. Annals of Internal Medicine, 165(11), 753–760] Science and facts💡

As the light passes from water to air, it is refracted. At a critical angle, the light bounces off the internal boundary of the water stream: it's called total internal reflection Science and facts💡

A single 30-minute session in a Finnish sauna heated to approximately 163 degrees Fahrenheit or 73 degrees Celsius and paired with a brief cold shower midpoint produces a rapid, transient spike in circulating white blood cells. To discover this, researchers studied 51 adults with an average age of 50. The participants spent 30 minutes in the heated environment with a cooling break positioned precisely midway through the routine. Blood samples were collected immediately before the session, right after the session, and 30 minutes later to track real-time physiological shifts. Immediately after the heat exposure, researchers measured significant increases in several groups of immune cells, including neutrophils and lymphocytes. Neutrophils act as first responders that react quickly to infections. Lymphocytes include cells that produce antibodies, coordinate broader immune responses, and destroy infected cells. The researchers suggest that the session mobilized these cells from other areas of the body directly into the bloodstream, which is a temporary cellular redistribution that closely mirrors the effects of physical exercise. However, a higher concentration of immune cells in the blood does not automatically mean better protection against illness. The immune surge proved highly temporary, as neutrophil and lymphocyte counts returned entirely to their starting levels within 30 minutes of completing the session. While some other white blood cells remained elevated, the study did not test whether participants became better at fighting infections over time. Furthermore, because the routine included a cold shower, the experiment could not isolate the effects of heat stress alone. [Heinonen, I. H., Koivula, T., Hollmen, M., Immonen, J., Kunutsor, S. K., Jalkanen, S., and Laukkanen, J. A. (2026). Acute Finnish sauna heat exposure induces stronger immune cell than cytokine responses. Temperature, 1, 14. DOI: 10.1080/23328940.2026.2115572] Science and facts💡

Callie, a remarkable Sprocker Spaniel trained by the charity Medical Detection Dogs, can successfully sniff out stage 1 bowel cancer from human urine samples. Working in partnership with researchers, this bio-detection dog is helping to pioneer a completely non-invasive way to catch colorectal cancer at its earliest, most treatable stage. During her trials, Callie proved she could identify the presence of the disease using as little as two milliliters of a urine sample. She is highly specific in her detection, meaning she can accurately single out the distinct odor of colorectal cancer while ignoring other inflammatory bowel conditions like Crohn's disease, irritable bowel disease, and diverticulitis. This ongoing research aims to eventually develop electronic "e-nose" diagnostic tools modeled after her powerful sense of smell to support traditional screening methods like colonoscopies. Science and facts💡

A clever African grey parrot named Rocco went viral after being caught using Alexa to secretly order snacks and toys from Amazon while home alone. Rocco, who lives in the United Kingdom with his owner Marion Wischnewski, mastered the smart assistant by mimicking human speech. He successfully added items like strawberries, broccoli, ice cream treats, and toys to shopping lists, and even attempted to place full orders. His owner first noticed something unusual when random items started appearing in her Amazon cart. After some investigation, she discovered that Rocco had been chatting with Alexa whenever he was left unsupervised. Originally rescued by the National Animal Welfare Trust, Rocco’s mischievous intelligence has captivated people worldwide, highlighting just how clever and playful African grey parrots can be. Science and facts💡

Zooming in on the Moon and Saturn using an Orion XT8 Dobsonian telescope. This is the closest you'd see them in 2026. Science and facts💡

Visualization of the fact that the exterior angles of a polygon always add up to 360 degrees Science and facts💡

Melting metal at 40 ft with 1000 W laser gun Science and facts💡

The future of traffic control: Smart Robotic Barriers in action Science and facts💡

A rare but usually harmless eye variation in some Burmese cats that looks like a tiny spider across the pupil. Science and facts💡

Why America feels colder than Europe. Science and facts💡

Google has been ordered to suspend construction activities in Finland after clearing approximately 250,000 trees for a planned data center. Every tree that stood on the 815-acre site only a few months earlier has now been removed. The Finnish Licensing and Supervision Authority (LVV) issued the stop-work order for the Muhos and Otanmäki locations after determining that the trees were felled before the required environmental impact assessment had been completed. Antti Järvinen, Google’s manager for Finland, has issued an apology while stating that the company proceeded on the basis of its best understanding of the applicable legislation at the time. The Muhos and Otanmäki developments form part of a $17 billion Google AI project. Science and facts💡