The New Physics and Its Evolution

A frog’s convulsing muscles, a new battery, and metals no one expected: a century ago, physics had its own apparent revolution. What if today’s upheaval is not a break with the past, but its continuation?

Writing in the early twentieth century, Lucien Poincaré looks at a field stirred by X-rays, radium, and new ideas about matter. He sets these discoveries beside earlier shocks—the galvanic battery, the strange behavior of light, and the challenge to old beliefs about heat—and argues that science advances less by sudden overthrow than by building anew from what came before. As fresh questions draw physicists into unfamiliar territory, the past proves neither settled nor discarded. How much of tomorrow’s physics is already hidden in yesterday’s discoveries?

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