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Posts Tagged ‘history of science

“Leaves of Three, Leave Them Be”*…

Pesky Pete Barron pulls out the poison Ivy plants and roots

Gabrielle Emanuel on the one of climate change’s winners– the hiker’s scourge, poison ivy…

Over a decade ago, when Peter Barron started removing poison ivy for a living, he decided to document his work.

“Every year I always take pictures of the poison ivy as it’s blooming,” said Barron, who is better known as Pesky Pete, of Pesky Pete’s Poison Ivy Removal.

He still remembers the photos he took of the very first tiny, red, shiny poison ivy leaves popping out in Massachusetts and southern New Hampshire.“

When I first started, it was May 10 or May 11,” he remembered. “I was so excited. I was like, ‘Wow, the season is here’.”

Now, if he lines up all his photos from 14 years, the first sighting comes almost a month earlier. In 2023, his first glimpse was on April 18.

Barron may have unwittingly documented an effect of climate change.

Poison ivy is poised to be one of the big winners in this global, human-caused phenomenon. Scientists expect the dreaded three-leafed vine will take full advantage of warmer temperatures and rising levels of carbon dioxide in the atmosphere to grow faster and bigger — and become even more toxic.

Experts who have studied this plant for decades warn there are likely to be implications for human health. They say hikers, gardeners, landscapers and others may want to take extra precautions — and get better at identifying this plant — to avoid an itchy, blistering rash…

Ugh: “Bigger, earlier and itchier: Why poison ivy loves climate change,” from @gabrieman and @WBUR.

* Adage

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As we cache cortisone cream, we might send carefully-calibrated birthday greetings to Guillaume Amontons; he was born on this date in 1663. A physicist and scientific instrument inventor, he developed the air thermometer – which relies on increase in volume of a gas (rather than a liquid) to measure temperature – and used it (in 1702) to measure change in temperature in terms of a proportional change in pressure. This observation led to the concept of absolute zero in the19th century. 

Deaf from childhood, Amontons worked on inventions for the hearing impaired, among them the first telegraph, which relied on a telescope, light, and several stations to transmit information over large distances. And Amontons’ laws of friction, relied upon by engineers for 300 years, state that the frictional force on a body sliding over a surface is proportional to the load that presses them together and is independent of the areas of the surfaces.

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“A prudent question is one-half of wisdom”*…

Sir Francis Bacon, portrait by Paul van Somer I, 1617

The death of Queen Elizabeth I created a career opportunity for philosopher and statesman Francis Bacon– one that, as Susan Wise Bauer explains– led him to found empiricism, to pioneer inductive reasoning, and in so doing, to advance the scientific method…

In 1603, Francis Bacon, London born, was forty-three years old: a trained lawyer and amateur philosopher, happily married, politically ambitious, perpetually in debt.

He had served Elizabeth I of England loyally at court, without a great deal of recognition in return. But now Elizabeth was dead at the age of sixty-nine, and her crown would go to her first cousin twice removed: James VI of Scotland, James I of England.

Francis Bacon hoped for better things from the new king, but at the moment he had no particular ‘in’ at the English court. Forced to be patient, he began working on a philosophical project he’d had in mind for some years–a study of human knowledge that he intended to call Of the Proficience and Advancement of Learning, Divine and Human.

Like most of Bacon’s undertakings, the project was ridiculously ambitious. He set out to classify all learning into the proper branches and lay out all of the possible impediments to understanding. Part I condemned what he called the three ‘distempers’ of learning, which included ‘vain imaginations,’ pursuits such as astrology and alchemy that had no basis in actual fact; Part II divided all knowledge into three branches and suggested that natural philosophy should occupy the prime spot. Science, the project of understanding the universe, was the most important pursuit man could undertake. The study of history (‘everything that has happened’) and poesy (imaginative writings) took definite second and third places.

For a time, Bacon didn’t expand on these ideas. The Advancement of Learning opened with a fulsome dedication to James I (‘I have been touched–yea, and possessed–with an extreme wonder at those your virtues and faculties . . . the largeness of your capacity, the faithfulness of your memory, the swiftness of your apprehension, the penetration of your judgment, and the facility and order of your elocution …. There hath not been since Christ’s time any king or temporal monarch which hath been so learned in all literature and erudition, divine and human’), and this groveling soon yielded fruit. In 1607 Bacon was appointed as solicitor general, a position he had coveted for years, and over the next decade or so he poured his energies into his government responsibilities.

He did not return to natural philosophy until after his appointment to the even higher post of chancellor in 1618. Now that he had battled his way to the top of the political dirt pile, he announced his intentions to write a work with even greater scope–a new, complete system of philosophy that would shape the minds of men and guide them into new truths. He called this masterwork the Great Instauration: the Great Establishment, a whole new way of thinking, laid out in six parts.

Part I, a survey of the existing ‘ancient arts’ of the mind, repeated the arguments of the Advancement of Learning. But Part II, published in 1620 as a stand-alone work, was something entirely different. It was a wholesale challenge to Aristotelian methods, a brand-new ‘doctrine of a more perfect use of reason.’

Aristotelian thinking relies, heavily, on deductive reasoning for ancient logicians and philosophers, the highest and best road to the truth. Deductive reasoning moves from general statements (premises) to specific conclusions.

MAJOR PREMISE: All heavy matter falls toward the center of the universe. MINOR PREMISE: The earth is made of heavy matter. MINOR PREMISE: The earth is not falling. CONCLUSION: The earth must already be at the center of the universe.

But Bacon had come to believe that deductive reasoning was a dead end that distorted evidence: ‘Having first determined the question according to his will,’ he objected, ‘man then resorts to experience, and bending her to conformity with his placets [expressions of assent], leads her about like a captive in a procession.’ Instead, he argued, the careful thinker must reason the other way around: starting from specifics and building toward general conclusions, beginning with particular pieces of evidence and working, inductively, toward broader assertions.

This new way of thinking–inductive reasoning–had three steps to it. The ‘true method’ Bacon explained,

‘first lights the candle, and then by means of the candle shows the way; commencing as it does with experience duly ordered and digested, not bungling or erratic, and from it deducing axioms, and from established axioms again new experiments.’

In other words, the natural philosopher must first come up with an idea about how the world works: ‘lighting the candle.’ Second, he must test the idea against physical reality, against ‘experience duly ordered’–both observations of the world around him and carefully designed experiments. Only then, as a last step, should he ‘deduce axioms,’ coming up with a theory that could be claimed to carry truth. 

Hypothesis, experiment, conclusion: Bacon had just traced the outlines of the scientific method…

Francis Bacon and the Scientific Method

An excerpt from The Story of Western Science by @SusanWiseBauer, via the invaluable @delanceyplace.

* Francis Bacon

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As we embrace empiricism, we might send carefully-transmitted birthday greetings to Augusto Righi; he was born on this date in 1850. A physicist and a pioneer in the study of electromagnetism, he showed that showed that radio waves displayed characteristics of light wave behavior (reflection, refraction, polarization, and interference), with which they shared the electromagnetic spectrum. In 1894 Righi was the first person to generate microwaves.

Righi influenced the young Guglielmo Marconi, the inventor of radio, who visited him at his lab. Indeed, Marconi invented the first practical wireless telegraphy radio transmitters and receivers in 1894 using Righi’s four ball spark oscillator (from Righi’s microwave work) in his transmitters.

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“Historians will silently murder you with their eyeballs if you say ‘Dark Ages’ unironically”*…

Abbot Richard Wallingford measuring a bronze disc as part of his scientific studies

Henrik Lagerlund explains how medieval thinkers foreshadowed modern physics in investigating the character of machines, devices, and the forces that animate them…

The Middle Ages still suffers from the embarrassment of comparison. Before it glowed the light of the ancient Greeks – the great, early speculators of the natural world and our place in it. After the Middle Ages came the scientific revolution – Copernicus, Galileo, Newton – and the surging onrush of modernity. Even if the idea of the so-called ‘dark ages’ is waning, there remains the widespread impression that the Middle Ages is in some sense a time of stagnancy, especially in its understanding of science and the natural world. Is this an accurate view of medieval science? There is one discipline, often overlooked, that serves to illuminate the Middle Ages, as well as its place in the history of scientific thought: mechanics.

The predominant assumption about the rise of modern science is that it went hand in hand with the conception of nature as a universal mechanism. By viewing nature in this way, it could be studied, analysed and experimented upon with mathematical rigour, and its functioning could be elucidated by physicists harnessing empirical methods. While the motion of inanimate bodies became theorised on the model of projectiles, some mechanical philosophers even claimed that the complex organisation of animate bodies could be understood on the model of levers, springs, pulleys and other mechanical devices. This step – nature as a universal mechanism – is often seen as the important break from the Middle Ages.

But, in fact, mechanics was not unknown in the Middle Ages, and medieval thinkers continuously discussed mechanical problems at the crossroads of natural philosophy and mathematics. Mechanics enjoyed continuous interest and progress throughout the Middle Ages, and modern physicists and mathematicians relied to a large extent on results inherited from the Middle Ages. But mechanics as a scientific discipline did not always go under that name.

Taking this into account, a close look at the Middle Ages reveals that the consideration of mechanics as a core part of physics, together with the mathematical treatment of weights, forces and resistances, all generally assumed to characterise the birth of modern science, was there long before Galileo. That means that medieval thinkers did not simply lay the foundations of the scientific revolution. It means they started it. There should be no more embarrassment of comparison for that great era of scientific thought, especially when we review the fascinating history of mechanics…

Read on for that review: “Machina mundi,” from @HenrikLagerlund in @aeonmag.

Greg Jenner (@greg_jenner)

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As we give credit where credit is due, we might note that today is the Summer Solstice– or Midsummer– the day with the longest period of daylight and shortest night of the year, when the Sun is at its highest position in the sky.

Often celebrated during the Middle Ages as the Feast of St. John (six months “opposite” the celebration of Christ, for whom John “paved the way”), it has pagan roots, and was often observed with songs, games, displays, processions, mystery plays, and dancing (often around a Maypole), which served to repel witches and evil spirits.

Midsummer celebrations in medieval Russia (source)

Written by (Roughly) Daily

June 21, 2023 at 1:00 am

“There is only one good, knowledge, and one evil, ignorance”*…

The School of Athens (1509–1511) by Raphael, depicting famous classical Greek philosophers (source)

If only it were that simple. Trevor Klee unpacks the travails of Galileo to illustrate the way that abstractions become practical “knowledge”…

… We’re all generally looking for the newest study, or the most up-to-date review. At the very least, we certainly aren’t looking through ancient texts for scientific truths.

This might seem obvious to you. Of course you’d never look at an old paper. That old paper was probably done with worse instruments and worse methods. Just because something’s old or was written by someone whose name you recognize doesn’t mean that it’s truthful.

But why is it obvious to you? Because you live in a world that philosophy built. The standards for truth that you imbibed as a child are not natural standards of truth. If you had been an educated person in 1200s Europe, your standard for truth would have been what has stood the test of time. You would have lived among the ruins of Rome and studied the anatomy texts of the Greek, known that your society could produce neither of those, and concluded that they knew something that your society could not. Your best hope would then be to simply copy them as best as possible.

This was less true by the time Galileo was alive. This is why an educated man like Galileo would have entertained the idea that he knew better than the ancient Greeks, and why his ideas found some purchase among his fellow academicians (including the then Pope, actually). But still, there was a prominent train of thought that promoted the idea that a citation from Aristotle was worth more than a direct observation from a telescope.

But you live in a different world now. You live in a world in which the science of tomorrow is better than the science of today, and our societal capabilities advance every year. We can build everything the ancients did and stuff they never even imagined possible. So you respect tradition less, and respect what is actually measured most accurately in the physical world more.

Today, this battle over truth is so far in the past that we don’t even know it was ever a battle. The closest we come to this line of reasoning is when new age medicine appeals to “ancient wisdom”, but even they feel compelled to quote studies. Even more modern battles are mostly settled, like the importance of randomized, double-blinded controlled studies over non-randomized, non-controlled studies.

The reason we mark battles is not just for fun or historical curiosity. It’s to remind us that what we take for granted was actually fought for by generations before us. And, it’s to make sure that we know the importance of teaching these lessons so thoroughly that future generations take them for granted as well. A world in which nobody would dream of established theory overturning actual empirical evidence is a better world than the one that Galileo lived in…

On the importance of understanding the roots of our understanding: “You live in a world that philosophy built,” from @trevor_klee via @ByrneHobart.

Apposite (in an amusing way): “Going Against The Grain Weevils,” on Aristotle’s Generation of Animals and household pests.

* Socrates, from Diogenes Laertius, Lives and Opinions of Eminent Philosophers (probably early third century BCE)

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As we examine epistemology, we might send elegantly phrased and eclectic birthday greetings to Persian polymath Omar Khayyam; the philosopher, mathematician, astronomer, epigrammatist, and poet was born on this date in 1048. While he’s probably best known to English-speakers as a poet, via Edward FitzGerald’s famous translation of (what he called) the Rubaiyat of Omar Khayyam, Fitzgerald’s attribution of the book’s poetry to Omar (as opposed to the aphorisms and other quotes in the volume) is now questionable to many scholars (who believe those verses to be by several different Persian authors).

In any case, Omar was unquestionably one of the major philosophers, mathematicians and astronomers of the medieval period.  He is the author of one of the most important treatises on algebra written before modern times, the Treatise on Demonstration of Problems of Algebra, which includes a geometric method for solving cubic equations by intersecting a hyperbola with a circle.  His astronomical observations contributed to the reform of the Persian calendar.  And he made important contributions to mechanics, geography, mineralogy, music, climatology and Islamic theology.

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Written by (Roughly) Daily

May 15, 2023 at 1:00 am

“Protons give an atom its identity, electrons its personality”*…

If an electron were the size of Earth, the experiment could detect a bump the size of a sugar molecule

If the electron’s charge wasn’t perfectly round, it could reveal the existence of hidden particles– and launch a “new physics.” But, as Zack Savitsky reports, a new measurement approaches perfection…

Imagine an electron as a spherical cloud of negative charge. If that ball were ever so slightly less round, it could help explain fundamental gaps in our understanding of physics, including why the universe contains something rather than nothing.

Given the stakes, a small community of physicists has been doggedly hunting for any asymmetry in the shape of the electron for the past few decades. The experiments are now so sensitive that if an electron were the size of Earth, they could detect a bump on the North Pole the height of a single sugar molecule.

The latest results are in: The electron is rounder than that.

The updated measurement disappoints anyone hoping for signs of new physics. But it still helps theorists to constrain their models for what unknown particles and forces may be missing from the current picture…

More at “The Electron Is So Round That It’s Ruling Out Potential New Particles,” from @savagitsky in @QuantaMagazine.

* Bill Bryson

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As we ponder perfection, we might spare a thought for Jean Baptiste Perrin; he died on this date in 1942. A physicist, he studied the Brownian motion of minute particles suspended in liquids (sedimentation equilibrium), and verified Albert Einstein’s explanation of the phenomenon– thereby confirming the atomic nature of matter… for which he was awarded the Nobel Prize for Physics in 1926.

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Written by (Roughly) Daily

April 17, 2023 at 1:00 am