Alright, my brainy friends: it won’t take you but a New York minute to look at this diagram and figure out what’s wrong here.That’s right! The earth is in the middle of the entire universe, and of course we know that’s just silly. But such was the model of the cosmos bequeathed by the Ancient […]
Ancient Greek Theory of Geocentrism Read More »
Although other scientists are more famous for getting the astronomical idea of heliocentrism correct, Johannes Kepler (d. 1630) was much more successful than his peers at explaining super important aspects of our solar system (for instance, the planets go round the sun in ellipses). Who would have thought that a driving force behind his significant
Johannes Kepler’s Theory of Heliocentrism Read More »
Lucky you, readers: you get to look now at a page of one of the most important texts in recorded history – the _Almagest_, by Ptolemy. I’d say go ahead and fight me if you disagree, but our times call for gentler interaction with each other, so instead I will just try to convince you.Although
Ptolemy’s “The Almagest” Read More »
Here’s Sir Isaac Newton, sporting what looks like some pretty fantastic quarantine hair in his 46th year. Solitary, misanthropic, and quirky (he once experimented on optics by putting a needle deep into his eyesocket to see how his vision would change), Newton’s work on classical mechanics revolutionized how people understood the cosmos. We all can
Isaac Newton’s Blended Scientific and Occult World Views Read More »
We don’t need to wrestle with our beliefs to look at this image of a man undergoing bloodletting (about 1675) to know that this medical practice seems like a bad idea. Sure, the Ancient Greeks might have thought it could cure illnesses, but they had a totally incorrect idea that sickness originated in an imbalance
The Extended Use of Bloodletting Throughout History Read More »
In our final post in this week’s series on poisonings in history, I am featuring Alan Turing’s death by cyanide. Turing was, of course, the famous father of theoretical computer science, paving the way for Artificial Intelligence in his development of the “Turing machine,” a mathematical model of computation that enabled much of what we
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The two pictures shown here accompanied two of the most important “aha!” moments in history. The first is “Photo 51,” taken under the laboratory research of Rosalind Franklin. It shows an X-ray diffraction pattern of DNA, and Franklin, Watson, and Crick used it to figure out the molecular structure of life itself.The second is a
Famous Images From Science Read More »
Just last week (12 March 2021) a team of scholars that included a mathematician, a physicist, and a clockmaker (among others) unveiled an answer to one of the greatest puzzles in history — how the famed “Antikythera Mechanism” worked.Since 1901, when a diver off the coast of Greece (Antikythera, to be exact) found an unusual
The Inner-Workings of the “Antikythera Mechanism” Read More »
If you think of the words “occult”, “arcane”, or “mystical” when you look at this Medieval text, you aren’t alone — the association of the Middle Ages with backwardness and the irrational has a long tradition. But it wouldn’t be a correct impression, at least not entirely. And this manuscript shows why. Written in 1393
John Westwyk and “The Equatorie of the Planetis” Read More »
The lunar crater you see here is Aristarchus, and we’re not going to be be able to get any closer than that to an accurate portrait of the eponymous Ancient Greek astronomer because most of his writings — as well as any contemporary sculpture or paintings of the man — are lost to the sands
Aristarchus’s Model of the Universe Read More »
Lots of animals love to play — many of us mammals will forgo food and sleep just to take part in exploratory fun. Humans have excelled at a specific type of play that comes in the form of games.Games are more formal than most types of play. They involve rules and have uncertain outcomes .
Ancient Chinese Board Game “Go” Read More »
We all know (some of us might still be sad about it) that Pluto was demoted to a “dwarf-planet” status back in 2006. In other news, however (and mayhaps this could make up for Pluto’s decline), some scientists have speculated that another planet — known as Planet Nine — might be orbiting our sun.Ideas about
This is one folio from the precious “Blue Qur’an,” dating from about 850-950 CE. The indigo-dyed parchment is adorned with gold and silver lettering, a treasured example of the heights to which the Arabic-speaking Muslim world brought the art of calligraphy. The era in which this copy of the Qur’an was written overlaps with the
Al-Kindī, Calligraphy and Cryptography in 9th c Middle East Read More »
One of the biggest questions about our universe had long been just how big it is. Of course the stars we see are far away, but just how far was unknown for most of human history. Figuring out the answer to this question was an enormous challenge: it isn’t the case that the brightest stars
Henrietta Swan Leavitt and the “Standard Candle” Read More »
Back in school I didn’t understand that mathematics isn’t a bunch of static, objective “facts.” Rather, mathematicians work out their ideas in conversation with each other, and invent new concepts in the process. The manuscript you are looking at here was one of the most important math texts in history. Its author, Gerolamo Cardano, thought
Gerolamo Cardano’s “Ars Magna” Read More »
Yesterday I did a post about the “boring billion”: a period of Earth’s history when very little changed. Today I offer the exact opposite, which is the most exciting two minutes in all of existence. And those in fact were the first two minutes of everything, at the start of the Big Bang. We
Many of us have had need to wrap presents in the last few weeks, but maybe only some of us waited until early this morning on December 25 to start wrapping their children’s gifts. (Yours truly, ahem). The discipline of intentionally folding paper into different shapes is known as origami because this practiced flourished
You are looking at an artist’s rendition of a device known as “the staff of al-Tusi” which sounds like a magical weapon straight out of Tolkien but in fact was a genius scientific tool made by one of the most important mathematicians in history. Sharaf al-Din al-Muzaffar al-Tusi (c. 1135-1213) lived in various cities
The Linear Astrolabe of al-Tusi Read More »
M.C. Escher was an amazing surrealist artist whose works were frequently inspired by mathematics. Here is his 1963 work, “Moebius Strip II,” which shows ants crawling along the single-surface loop. First discovered by astronomer and mathematician August Möbius in 1858 (although it had been described in unpublished literature a few years prior by a
M.C. Escher and the Möbius Strip Read More »
You are looking at a Colonial American recipe for abortion. Published in 1748, it was not the only at-home herbal abortifacient of the time, but it was one of the most well read. And given the publisher, that makes sense — it was Ben Franklin. Eager to adapt a British guidebook that had set out
A Colonial Recipe for Abortion Read More »
