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Health

1,016 cards. Each one is a 40-second story with a five-minute read behind it. Page 17 of 17.

961. Two-thirds of daily deaths track age-related causesOf roughly 150,000 people who die each day worldwide, about 100,000 die from ageing-linked disease. Reaction time may slow, yet vocabulary often holds; leading theories still spli…
962. Ethanol is humanity’s second-favorite psychoactive drugOnly caffeine outranks alcohol worldwide. Natufian beer goes back at least 13,000 years, global beverage sales topped US$1.5 trillion in 2017, and ethanol still acts as a brain de…
963. A normal liver clears only about eight grams of ethanol hourlyThat equals one British standard unit—and damaged livers run slower. Intoxication usually starts after two or more drinks; legal BAC cutoffs often sit between 0.025 and 0.080 perc…
964. WHO counted 283 million people with alcohol use disordersThat 2016 estimate sits beside a word coined in 1852 that clinics now often avoid. Genes and environment share the risk roughly equally, and a first-degree relative with the disor…
965. Allergy means harmless things treated as invadersIgE antibodies tag pollen, food, or latex, then mast cells dump histamine. Clemens von Pirquet coined the word in 1906. In rich countries roughly one in five people get allergic r…
966. If a therapy works, it usually stops being alternativeAlternative medicine promises healing without the scientific method’s usual proofs—plausibility, controlled trials, and repeatable benefit. History’s pattern is blunt: methods tha…
967. Alzheimer’s still has no treatment that reverses itIt drives about 60–70 percent of dementia cases. Roughly 50 million people lived with it worldwide by 2020, yet medicines only ease symptoms for a time. Plaques and tangles build …
968. Amphetamine treats ADHD—and can also hijack rewardLazăr Edeleanu isolated the chemical in 1887; medicine adopted it in the late 1920s as Benzedrine. Today it is first-line for ADHD and narcolepsy, while recreational megadoses ris…
969. Surgeons name amputations by the joint they spareBelow-knee and above-knee cuts dominate major lower-limb work, while Chopart, Lisfranc, and Syme label subtler foot and ankle levels. Rotationplasty even flips the foot so an ankl…
970. Painkillers dull pain without erasing all sensationThat is the conceptual line between analgesics and anesthetics. Greeks gave us the word—without pain—and before the twentieth century English speakers often said anodynes. Today t…
971. Anemia is the world’s most common blood disorderIt affects roughly one-fifth to one-third of people globally. Iron deficiency alone touches nearly a billion, and hemoglobin cutoffs differ by sex and pregnancy—under 130 g/L for …
972. Anesthesia is a reversible shutdown, not mere sleepClinicians carefully dial hypnosis, analgesia, amnesia, and muscle relaxation to fit each surgical procedure and each patient. General anesthesia erases awareness entirely; sedati…
973. An aneurysm is a ballooning weak spot in a vessel wallAs the bulge grows, rupture risk rises toward uncontrolled bleeding. True aneurysms involve all three arterial wall layers; false ones are contained leaks beside the vessel. The d…
974. Anthrax’s black scar named the disease after coalGreek anthrax meant coal, echoing the painless black eschar of cutaneous infection. Robert Koch identified Bacillus anthracis as the cause; globally at least two thousand human ca…
975. Nubians drank tetracycline centuries before FlemingChemical traces in skeletons from northern Sudan, about 350 to 550 CE, show systematic tetracycline intake—likely from Streptomyces-fermented grain beer. Antibiotics remade twenti…
976. Anxiety disorders hit nearly three in ten adults everThey rank second only to depression among mental disorders worldwide, with about 5.8 percent of people affected at any moment. Clinically, anxiety is dread without a clear, contro…
977. Anatomists restrict “arm” to shoulder-to-elbow onlyEveryday speech calls the whole upper limb an arm. Strict anatomy reserves the word for the humerus segment between shoulder and elbow; beyond that lies forearm, then hand—and a r…
978. Arthritis means joint cartilage worn until bone grindsPain and stiffness follow; swelling, warmth, and lost motion often join. Osteoarthritis tops the list at over 3.8 percent of people, rheumatoid arthritis about 0.24 percent—yet in…
979. Aspirin began as willow bark’s synthetic cousinSalicin from Salix trees has been used for at least 2,400 years. Bayer branded acetylsalicylic acid “Aspirin” by 1899; today humans swallow an estimated 40,000 tonnes yearly—some …
980. Asthma has no cure, yet most flares are controllableIn 2023 it affected an estimated 363 million people and caused about 442,000 deaths, mostly in lower-income countries. Airways tighten and mucus thickens when triggers hit—an anci…
981. ADHD sits at the extreme low end of self-regulationTwin and genetic work put heritability near 70–80 percent. It is not a social fashion of childhood: environmental hits act early—prenatal or soon after birth—and there is no biolo…
982. WHO estimates about one in a hundred children are autisticFigures for 2012–2021 put childhood diagnosis near one percent, and the share is climbing with broader criteria and awareness rather than a sudden biological jump. Autism is highl…
983. Autoimmunity turns the adaptive immune system inwardMore than eighty recognized diseases—possibly over a hundred—follow that misfire. A UK study found about one in ten people affected, women more often than men. Fatigue is not a so…
984. Ayurveda mixes ancient surgery with modern pseudoscience labelsUp to 80 percent of people in India and Nepal report using it. Classical texts taught rhinoplasty and cataract work, yet today’s overviews call the theory pseudoscientific—and som…
985. Han officials once got a bathing holiday every five daysFrom Shang cauldrons three millennia ago to Roman thermae with libraries, washing has been hygiene, ritual, medicine, and social theater. Indian grihya sutras from about 500 BCE e…
986. Benzodiazepines were the world’s top prescriptions by 1977Leo Sternbach stumbled onto chlordiazepoxide in 1955; Librium arrived in 1960 and Valium followed in 1963. They calm by boosting GABA at GABAA receptors—useful for a few weeks, an…
987. Biopsy means taking living tissue for a closer lookThe Greek roots say life plus sight. Ernest Besnier coined biopsie in 1879, but Abulcasis was already needling thyroid goiters around the eleventh century. Today pathologists read…
988. Bipolar risk is mostly genetic—yet twins still divergeHeritability estimates reach 70–90 percent, but identical twins share the diagnosis only about 40 percent of the time versus roughly 5 percent for fraternal pairs. Lifetime preval…
989. Healthy bodies can spare about one-tenth of their bloodLose 10–15 percent and most people stay medically stable; a typical donation removes only 8–10 percent. Beyond that threshold, hypovolemia and exsanguination loom—while named blee…
990. “Normal” blood pressure still depends who you askAmerican AHA/ACC guidance wants adults under 120/80 mmHg at rest; European ESC prefers under 120/70 instead. Global age-standardized averages have hovered near 127/79 in men and 1…
991. Blood tests are medicine’s most common lab windowA vein draw or fingerstick samples a fluid that visits every organ, so chemistry and cell counts reveal disease, drugs, minerals, and organ function. Panels bundle many assays fro…
992. Modern transfusion prefers parts of blood, not the wholeRed cells, plasma, platelets, and clotting factors travel separately; white cells almost never do. Triggers once sat near 100 g/L hemoglobin; evidence now often waits until about …
993. Until insulin arrived in 1922, type 1 diabetes was effectively a death sentence.People with type 1 diabetes usually died within months of diagnosis, and doctors' best treatment was a near-starvation diet. Then, in a Toronto lab in 1921, a young surgeon, Frede…
994. A doctor drank a broth of bacteria to prove what really causes ulcers.For decades, stomach ulcers were blamed mainly on stress, spicy food and too much acid. In 1984 the Australian doctor Barry Marshall, struggling to convince colleagues otherwise, …
995. A hole in one man's stomach revealed how digestion works.In 1822 a young fur trader named Alexis St. Martin was shot at close range and survived with a permanent opening into his stomach. An army surgeon, William Beaumont, spent years l…
996. London's deadliest cholera outbreak was traced to a single street pump.In 1854 cholera killed hundreds in Soho within days. Most experts blamed foul air. The physician John Snow asked a simpler question, where did the dead get their water, and the an…
997. The brain's famous 'speech centre' is not quite what the textbooks say.A patient who could say only one syllable, 'tan', led the French physician Paul Broca to locate speech in a patch of the left frontal lobe. It became one of neuroscience's first g…
998. Were humans built to run long distances? A popular theory faces tough questions.No other primate can run long distances, and we sweat, steady our heads and store energy in springy tendons in ways that seem made for it. The endurance running hypothesis says ea…
999. A Boston dentist made surgery painless, then tried to patent it.On 16 October 1846, in a Boston operating theatre, William Morton had a patient inhale ether before a surgeon cut a tumour from his neck. The man felt no pain, and the news crosse…
1000. Cells taken from one woman in 1951 are still dividing in labs worldwide.In 1951 doctors in Baltimore took a sample of Henrietta Lacks's cervical tumour without asking her. Her cells did something no human cells had done before: they kept dividing in t…
1001. The word 'vaccine' comes from the Latin for cow.In 1796 Edward Jenner took material from a milkmaid's cowpox sores and put it into cuts on an eight-year-old boy's arm. Weeks later, exposure to smallpox left the boy unharmed. Je…
1002. Your blood type was discovered in 1901 by a Viennese pathologist.Mix blood from two people and sometimes the red cells clump together. In 1901 Karl Landsteiner worked out why, sorting human blood into the groups we now call A, B and O. Transfus…
1003. One of medicine's first controlled trials cured scurvy, then was ignored.In 1747 a Royal Navy surgeon, James Lind, split twelve sailors with scurvy into pairs and gave each pair a different remedy: cider, vinegar, seawater, oranges and lemons. The pair…
1004. The brain operation that won a Nobel Prize, then became a byword for barbarism.In 1949 the Nobel Prize in medicine went to António Egas Moniz for the leucotomy, better known as lobotomy: cutting connections to the brain's frontal lobes to treat mental illnes…
1005. A cheap drink of salt, sugar and water transformed the fight against cholera.Cholera and other diarrhoeal diseases kill largely by draining the body of water and salt. For decades the answer was an intravenous drip. Then researchers found that the gut keep…
1006. The man who couldn't make new memories taught us how memory works.In 1953 a surgeon removed parts of Henry Molaison's brain to stop his seizures. The seizures eased, but he could no longer form new long-term memories. For the next five decades, …
1007. A deadly Southern epidemic was blamed on germs. The real cause was diet.In the early 1900s pellagra, a disease of rashes, diarrhoea and dementia, swept the American South and affected some 3 million people. Most experts suspected a germ or toxic corn.…
1008. The man with an iron rod through his brain probably recovered.In 1848 an explosion drove a six-kilogram iron bar clean through Phineas Gage's skull. He survived, and textbooks made him the classic case of a personality destroyed by brain dam…
1009. Placebos can work even when patients know they're placebos.In a 2010 Harvard trial, people with irritable bowel syndrome were openly given 'sugar pills' and told exactly that. They still reported markedly better symptom relief than a grou…
1010. The 1954 test of the polio vaccine involved 1.8 million children.To test Jonas Salk's polio vaccine, the United States ran what was then the largest medical experiment in history. About 1.8 million children took part, many given either the vacc…
1011. In dreaming sleep, your brain is as busy as when awake, but you're paralysed.Several times a night your eyes start darting beneath closed lids, your brain burns energy as fast as it does when you are awake, and almost every muscle in your body goes limp. T…
1012. The doctor who told colleagues to wash their hands was ridiculed.In 1847 Ignaz Semmelweis noticed that mothers died far more often on the Vienna ward run by doctors than on the one run by midwives. He made the doctors wash their hands in chlori…
1013. While you sleep, your brain rinses itself.In 2013, researchers found that in sleeping mice the spaces between brain cells widened by about 60 per cent, letting cerebrospinal fluid flush through and wash out waste, includi…
1014. Cut the link between the brain's halves and each side knows different things.To treat severe epilepsy, surgeons sometimes sever the corpus callosum, the bridge between the brain's two hemispheres. In the 1960s Roger Sperry and Michael Gazzaniga found that …
1015. The stethoscope was invented to avoid an awkward moment.In 1816 the French doctor René Laennec needed to hear a young woman's heart, but pressing his ear to her chest felt improper. So he rolled a sheaf of paper into a tube and listene…
1016. Typhoid Mary never felt ill, and spent decades in quarantine.Mary Mallon was a cook for wealthy New York families, and typhoid seemed to follow her from house to house. She felt perfectly healthy, which is exactly what made her dangerous: s…

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