By 450 BCE, some were trying to convince humanity of the true nature of the solar system. They understood and promoted the idea that the moon was not a deity but a physical body. Anaxagoras was one of the earliest known proponents of this view. He deduced that the moon is made of solid rock […]
Anaxagoras (circa 500-428 BCE) Read More »
It took humanity millennia to transition from viewing large bones as relics of mythical creatures to recognizing them as evidence of extinct animals. The first significant step came in 1676 when Robert Plot, an English naturalist, described and illustrated a large thigh bone in his book “Natural History of Oxfordshire.” Although he believed it belonged
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30 Phil, Chapter 21, Galileo, Touchstone 54: Modern Cosmology. The story of Galileo is also the story of Copernicus, and the story of modern cosmology. To properly tell the story of Copernicus, we need to mention Aristarchus of Samos, a Greek astronomer and mathematician born around 310 BCE. Aristarchus put forth a heliocentric model, proposing
Although protozoa evolved from eukaryotes about 2 billion years ago, it was 1674 that humanity saw them for the first time. That’s when Antonie van Leeuwenhoek, using his meticulously crafted microscopes, discovered protozoa—the first microscopic observation of single-celled organisms. His detailed observations and descriptions of what he called “animalcules” in a drop of pond water
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James Clerk Maxwell predicted electromagnetic waves, but he did not perform experiments to prove their existence. His prediction was based on his work on the classical theory of electromagnetic radiation, which unified electricity, magnetism, and light as different manifestations of the same phenomenon. Maxwell’s equations for electromagnetism predicted the existence of waves of oscillating electric
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30 Phil, Chapter 1 Touchstone 3: Evolution. In 1859, the naturalist Charles Darwin revolutionized the scientific world with his seminal publication, “On the Origin of Species.” In it he formulated his scientific theory of evolution by natural selection. The process by which new species arise is well-understood. It proposed that changes in species occur gradually over time. With each generation,
13.8 billion years ago, space itself began expanding and cooling, setting the stage for particles, atoms, stars, galaxies, planets, life, and us.
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