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science-history

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Rosalind Franklin’s Photo 51: What the Image Shows and Why It Matters

Rosalind Franklin’s Photo 51 is an X-ray diffraction image of DNA that provided critical evidence for the double helix model. Taken in 1952 by Franklin and her student Raymond...

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Who Said Electrons Are Found in Electron Clouds

The idea that electrons occupy diffuse, cloud-like regions around the nucleus emerged gradually, but the modern formulation is most closely associated with Erwin Schrödinger an...

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The Age of Modern Humans: Definition, Origins, and Key Evidence

The phrase age of modern humans refers to the period since the first appearance of Homo sapiens, our species, in the fossil and genetic record. Modern humans are distinguished b...

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John Dalton and His Atomic Theory: A Clear, Verified Guide

John Dalton (1766–1844) was an English chemist, physicist, and meteorologist whose formulation of atomic theory laid the foundations of modern chemistry. This guide explains h...

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