Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now.
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Jabir ibn Hayyan was the first to describe processes such as liquefaction, crystallisation, distillation, purification, oxidisation, evaporation and filtration. He also did an early classification of chemical elements around their properties which seems pertinent, and noted that "a certain quantity of acid is necessary in order to neutralize a given amount ...


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The interaction of physics and artillery begins with Galileo (there was no physics to talk about before that time except the statics). There are pictures in the books before Galileo which show completely unrealistic trajectories of projectiles. Galileo developed a computational device which he called the Geometric and Military Compass, which he produced and ...


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From Polymnia Athanassiadi, Byzantine Commentators on the Chaldaean Oracles : Psellos and Plethon, in Katerina Ierodiakonou (editor), Byzantine Philosophy and its Ancient Sources (2004), page 237-on. Page 248 : In a letter to Theodora Palaeologina, Gennadios Scholarios offers the following information on [Georgius Gemistos] Plethon's spiritual grounding: ...


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Historians believe that the extant version of Problemata was not penned by Aristotle personally, but “while the Problemata is not the genuine Aristotelian work, it nevertheless contains an element derived from such a work”. Problemata XXXII.5 discusses breathing under water, including the oft quoted passage interpreted as referring to a diving bell:”Why do ...


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For Aristotle : Problemata Book XXXII, 960b,30-31 : “divers to respire equally well by letting down a cauldron”. Parts of Animals, Book II, 659a,5 : “Some divers, when they go down into the sea, provide themselves with a breathing-machine, by means of which they can inhale the air from above the surface while they remain for a long time in the water.” For ...


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As you yourself indicated, many works of mediaeval medicine from the Islamic world were translated into Latin, and they were indeed among the first printed books in Europe. Apart from Avicenna and the others mentioned by you there is (for example) ar-Rāzī (Rhazes) and his Liber continens. So obviously there was a strong influence of Muslim writers about ...


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Parallax was always measured by measuring the angular distances between stars. If it changes during the year, you see the parallax due to the Earth motion. The accuracy is limited by the accuracy of your angle-measuring device. A typical such device at the time of Brahe could measure to 1' or perhaps 0.5' (1' is the average resolution of the human eye). This ...


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