Health: quotes, facts and reflections - Page 6

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Q1574

WonderScience

In 1896 Henri Becquerel planned to test whether sunlight made uranium salts glow. Paris clouded over, so he shut everything in a drawer. Days later the photographic plate was fogged anyway — the uranium had been shining on its own.

His hypothesis was wrong in the most productive way possible: he thought sunlight was required, and the experiment proved it was not. Uranium emitted something entirely by itself. Marie and Pierre Curie took up the work, named the phenomenon radioactivity, and the three shared the 1903 Nobel Prize in Physics. A week of bad weather in Paris opened the door to nuclear physics, medical imaging and radiotherapy — and to a century of learning, painfully, how to handle what was found.

Physics historyRead card

Q1577

WonderHealth

Cattle in 1930s America were bleeding to death from spoiled hay. The chemical behind it became a rat poison — and then warfarin, the blood thinner that has kept millions of people from having strokes.

A Wisconsin farmer drove through a blizzard in 1933 with a dead cow and a bucket of blood that would not clot, looking for someone who could explain it. Biochemist Karl Link traced it to mouldy sweet clover, which produces an anticoagulant. Sold first as rat poison — rats die of internal bleeding — it was later found safe in controlled human doses. President Eisenhower was given it after his heart attack in 1955, which did much for its reputation. It remains one of the most prescribed drugs in the world.

Medical historyRead card

Q1595

WonderTechnology

A chemist searching for clear gun sights in 1942 kept producing a compound that stuck to everything and ruined his equipment. He set it aside twice. Only years later did he realise the sticking was the product.

Cyanoacrylate bonded instantly to anything faintly damp — including skin and lab glass — which made it useless for the optics work Coover was doing. He rediscovered it in 1951 while developing heat-resistant aircraft canopies, and this time recognised what he had: an adhesive needing no heat or pressure. It reached shops in 1958. Field surgeons in Vietnam used a spray version to close wounds fast enough to get men to hospital, and medical-grade cyanoacrylate still seals surgical incisions today.

Invention historyRead card

Q1601

WonderHistory

For years London poured its waste into the Thames and did nothing. Then the summer of 1858 grew hot, the river stank so badly that Parliament soaked its curtains in chloride of lime, and the money for a sewer system was approved in eighteen days.

Members debated moving upriver to Hampton Court. Joseph Bazalgette was given the job and built 132 km of main sewers and 1,700 km of street sewers, deliberately sizing the pipes at twice the diameter the calculations required — a decision that kept them working for well over a century. Cholera in London effectively ended, though the connection to dirty water was still disputed at the time. Much of Bazalgette's brickwork is still carrying London's waste today.

London MuseumRead card

Q1602

WonderHealth

In 1854 a Soho cholera outbreak killed hundreds in ten days. John Snow mapped every death, saw them cluster around a single water pump, and persuaded the parish to remove its handle. The outbreak stopped.

Nobody yet accepted that water carried disease; the consensus blamed bad air. Snow's map of Broad Street, with a black bar for each death, is the founding document of epidemiology and one of the most influential graphics ever drawn. He also spotted the exceptions that proved him right — the local brewery workers, who drank beer, were untouched. The authorities put the pump handle back once the panic passed. Snow died four years later, before his idea was generally accepted.

London MuseumRead card

Q1622

WonderHealth

In the early 1990s a Welsh trial tested a new compound for angina. It did little for chest pain, but the men in the study were oddly reluctant to hand back the leftover tablets. The drug was renamed Viagra.

Sildenafil was designed to relax blood vessels and improve blood flow to the heart. It underperformed on that measure at Pfizer's trial site in Merthyr Tydfil, and the study was heading for closure when nurses reported the persistent side effect volunteers were declining to discuss in detail. The company changed direction, and it was approved in 1998. The same molecule is also used, under a different name, to treat pulmonary hypertension in babies — the use it was closest to being designed for all along.

Pharmaceutical historyRead card

Q1632

DriveArt

Cancer surgery left Henri Matisse unable to stand at an easel. Instead of stopping, he began cutting painted paper with scissors from his bed — and made the boldest work of his life.

After abdominal surgery in 1941 he was given months to live, and called the years that followed 'a second life'. Too weak to paint standing, he had assistants pin gouache-painted sheets to the walls of his room while he cut shapes with scissors and directed their placement from a wheelchair or bed. He called it drawing with scissors — the line and the colour arriving in a single cut. The cut-outs, made in his seventies and eighties, are now considered among the most radical things he ever did.

TateRead card

Q1633

DriveArt

Rheumatoid arthritis deformed Pierre-Auguste Renoir's hands so badly he could no longer grip. He kept painting for another twenty years, with brushes placed into his bandaged fingers.

By his sixties the disease had fused and twisted his joints, and he needed help to move. Assistants wrapped his hands and set a brush between his fingers so he could work by moving his whole arm and shoulder. He painted almost daily until the year he died, and in his last decade also took up sculpture, directing an assistant's hands to shape what he could no longer model himself. Asked why he continued through the pain, he is said to have replied that the pain passes, but the beauty remains.

Art historyRead card

Q1634

DriveArt

Cataracts turned Claude Monet's world muddy yellow and red. He kept painting the water lilies anyway, and after surgery in 1923 restored his sight, he went back and reworked canvases he had made half-blind.

Diagnosed in 1912, Monet described colours losing their intensity and reds looking muddy; he began labelling his tubes and keeping a fixed order on his palette so he could paint by system rather than by eye. Some canvases from those years are startlingly hot in tone. He resisted surgery for a decade, terrified it would ruin what vision he had, and finally had a lens removed in 1923. Seeing clearly again, he destroyed some of the works and reworked others. The great Orangerie panels were finished in this period.

Art historyRead card

Q1636

DriveLiterature

John Milton lost his sight completely by 1652 and had backed the losing side of a civil war. Blind, politically disgraced and composing at night from memory, he dictated Paradise Lost to whoever would write it down.

He would hold long passages in his head overnight and wait, by his own account impatiently, to be 'milked' in the morning by a daughter, friend or paid amanuensis. The poem runs to more than ten thousand lines of blank verse and was published in 1667, after the Restoration had left him lucky to be alive at all. He sold the rights for £5, with a further £5 due on the second edition. He wrote in it that the mind is its own place, and can make a heaven of hell.

Literary historyRead card

Q1651

WonderMind

Patients told outright that they were being given inert pills — no deception at all — still improved in trials for chronic back pain and irritable bowel syndrome. The effect survived knowing.

Ted Kaptchuk's group at Harvard ran the first trials, handing patients bottles labelled 'placebo pills' and explaining plainly that they contained no active drug. Symptoms still eased, more than in patients given nothing. The likeliest explanations involve expectation, the ritual of treatment and the attention of a clinician, all of which have measurable effects on symptom perception. It works on subjective symptoms such as pain, fatigue and nausea — not on tumours or infections. It is a real effect with strict limits, and it is not a substitute for treatment.

Harvard Medical SchoolRead card

Q1652

StillnessMind

Focused work drains a specific mental resource, and city streets keep draining it because they demand constant filtering. Natural settings hold attention gently instead, letting the depleted system recover.

Rachel and Stephen Kaplan proposed the distinction: directed attention, which we spend on concentration and must be replenished, and 'soft fascination' — moving leaves, water, clouds — which occupies the mind without effort. Studies since have found improvements in working memory and error rates after walks in parks compared with walks in traffic, with the same distance and exertion. The practical read is modest but consistent: when your concentration is gone, more effort works badly, and twenty unhurried minutes among trees works better.

Attention restoration theoryRead card

Q1654

DriveHealth

Working muscle releases signalling molecules into the blood that reach the brain, liver, bone and immune system. Muscle is not just for moving — it is a gland you operate by using it.

The Danish physiologist Bente Klarlund Pedersen named these molecules myokines in 2003, and hundreds have since been identified. They help explain why exercise affects so much beyond fitness — mood, blood sugar handling, bone density, inflammation, and the brain's capacity to form new connections. It reframes what training is for: not primarily an appearance or a weight number, but the regular activation of a signalling organ that otherwise stays quiet. The dose required is far lower than most people assume.

Exercise physiologyRead card

Q1655

StillnessHealth

Every waking hour, adenosine accumulates in the brain and builds the pressure to sleep. Caffeine does not remove it — it blocks the receptors. The adenosine is still there, and arrives all at once when the caffeine clears.

Adenosine is a by-product of the brain using energy, so the longer you are awake the more of it collects, and the heavier sleep feels. Caffeine is shaped enough like adenosine to sit in its receptors without activating them, which mutes the signal while the molecule keeps accumulating behind it. That is the afternoon crash: the block wears off and the full backlog registers at once. Caffeine's half-life is around five hours, so a late-afternoon coffee still has a quarter of its dose working at midnight.

Sleep scienceRead card

Q1656

StillnessHealth

Shinrin-yoku — forest bathing — is not a hike. It is unhurried time among trees with the phone away, and Japan has treated it as preventive medicine since the 1980s.

The term was coined by Japan's forestry ministry in 1982, and the country now designates dozens of official forest-therapy sites. Studies have reported lower blood pressure, reduced cortisol and improved mood after sessions, though many are small and comparing forest with city confounds air quality, noise and traffic. What is not in doubt is the direction. Several countries now run nature-prescription schemes, and the mechanism may simply be a combination of quiet, clean air, gentle movement and undemanding attention.

Japanese public healthRead card

Q1657

StillnessHealth

Sustained loneliness is associated with raised inflammation, higher blood pressure and worse immune response. Large reviews put its mortality risk in the same territory as well-known physical risk factors.

Julianne Holt-Lunstad's meta-analyses, covering hundreds of thousands of participants, found strong social relationships associated with a substantially higher likelihood of survival over follow-up. The effect held across age, sex and initial health. The causal direction is not fully settled — illness can cause isolation as well as follow it — but the association is robust enough that several countries now treat social connection as a public health priority. Quality matters more than quantity: a few close ties outperform a wide circle of acquaintances.

Public health researchRead card

Q1658

DriveHealth

Adults lose roughly 3–8% of muscle mass per decade from their thirties, and faster after sixty. The loss is not inevitable at that rate — resistance training and adequate protein slow it sharply, at any age.

Sarcopenia is age-related loss of muscle mass and strength, and it matters far beyond appearance: muscle underpins balance, blood sugar regulation, bone loading and the ability to get up unaided. Trials in people in their eighties and nineties, including nursing-home residents, have produced substantial strength gains within weeks of starting supervised resistance work. Protein needs rise rather than fall with age, because older muscle responds less readily to the same amount. It is one of the few declines with a genuinely well-evidenced countermeasure.

Geriatric medicineRead card

Q1659

DriveHealth

Aerobic exercise raises levels of BDNF, a protein that supports the survival of existing neurons and the growth of new connections. It is one of the strongest physical supports for a sluggish mind.

Brain-derived neurotrophic factor has been called fertiliser for the brain. Levels rise with sustained aerobic activity, and animal studies link that rise to growth in the hippocampus, a region central to memory and badly affected by ageing and depression. Human trials have found modest but repeated improvements in memory and executive function after months of regular activity, alongside measurable hippocampal volume changes. The effective dose in most studies is unremarkable: brisk walking, most days, for around forty minutes.

NeuroscienceRead card

Q1660

WonderHealth

Bone is not inert scaffolding. Cells are constantly dissolving old bone and laying down new, so the skeleton you have now is largely not the one you had a decade ago.

Osteoclasts break down bone tissue and osteoblasts rebuild it, in a continuous cycle that repairs micro-damage and releases calcium when the body needs it. The process responds directly to load: bone laid under strain gets stronger, which is why weight-bearing exercise builds density and why astronauts lose it rapidly in weightlessness. The balance tips with age, with breakdown outpacing rebuilding, and that shift is what osteoporosis is. The turnover rate varies by bone type, but the whole skeleton is substantially replaced over roughly a decade.

Human biologyRead card

Q1661

WonderHealth

Chronotype — the body clock that makes early mornings easy or brutal — is substantially heritable and shifts predictably with age. Teenagers really are wired to sleep later, and it is not laziness.

Large genome-wide studies have identified hundreds of variants associated with being a morning or evening person. The clock also drifts across a lifetime: it runs later through adolescence, peaking in lateness around nineteen or twenty, then gradually earlier through adulthood. Schools that have shifted start times later report improved attendance and grades. Evening types living on an early schedule accumulate what researchers call social jetlag — a chronic mismatch between body clock and alarm clock, linked to poorer health outcomes.

Circadian researchRead card

Q1662

DriveScience

Katalin Karikó spent decades being told her work on mRNA was a dead end. She was demoted repeatedly and pushed off the tenure track. That work became the foundation of the mRNA covid vaccines, and won a Nobel Prize.

mRNA is the molecule that carries instructions from DNA to the cell's protein factories. Karikó's idea was to write your own instructions and have the body build the medicine itself — but injected mRNA triggered a violent immune response, and grant after grant was refused. At the University of Pennsylvania she was demoted four times. Working with Drew Weissman, she found in 2005 that swapping one building block let mRNA slip past the immune system. Fifteen years later that fix was in billions of arms, and in 2023 the two of them shared the Nobel Prize in Medicine.

Nobel PrizeRead card

Q1664

DriveHealth

Doctors were certain stomach ulcers came from stress and spicy food. Barry Marshall thought a bacterium caused them, could not get anyone to listen, and swallowed a dish of it to prove his point. He became ill within days.

In 1984, working in Perth with the pathologist Robin Warren, Marshall could not find an animal model and could not persuade the field. So he drank a broth of Helicobacter pylori. He developed gastritis, proved the bacterium colonised a healthy stomach, and treated himself with antibiotics. The implication was enormous: a disease affecting millions was curable with a short course of pills rather than managed for life. He and Warren received the Nobel Prize in Medicine in 2005.

Nobel PrizeRead card

Q1668

DriveHealth

Tu Youyou screened hundreds of traditional Chinese remedies for something that would kill the malaria parasite. The answer came from a fourth-century text — and the crucial detail was that the plant had to be soaked cold, not boiled.

Working through the Cultural Revolution with almost no equipment, she and her team tested more than two thousand candidate preparations. Sweet wormwood kept showing promise and then failing. She went back to a Chinese medical text written around AD 340, which described steeping the herb in cold water, and realised heat was destroying the active compound. Extracted cold, artemisinin worked. She tested the first dose on herself. It has since saved millions of lives, and in 2015 she became the first Chinese woman to win a Nobel Prize in science.

Nobel PrizeRead card

Q1669

DriveHealth

The team that isolated insulin handed the patent to their university for one dollar apiece in 1923, so that no company could monopolise it. Banting is reported to have said that insulin belonged to the world, not to him.

Before insulin, a diagnosis of type 1 diabetes in a child was a death sentence within months. The Toronto team's discovery in 1921–22 reversed that almost overnight, and the sight of comatose children waking on the ward is one of the most extraordinary scenes in medical history. The three inventors assigned the American patent to the University of Toronto for a dollar each, intending that it stay cheap and universal. The famous quote is reported rather than documented — but the dollar, and the intention behind it, are on the record.

Banting HouseRead card