Age of Modernity and Progress

Historical Context

The late 19th and early 20th century existed in a fascinating tension. On one hand, positivism — the philosophy championed by Auguste Comte — held that scientific observation and reason were humanity's greatest tools, capable of explaining everything. Industrial Europe was riding high on this confidence: germ theory had conquered disease, engineers were shrinking the world with railways and telegraphs, and empires justified their expansion partly through appeals to scientific and rational superiority.

But underneath this optimism, cracks were forming. Darwin's evolution (1859) had already unsettled the idea that humans held a divinely special place in the universe. Rapid industrialization created brutal urban poverty that "rational" capitalism didn't seem to fix. And then WWI — the war that was supposed to be over by Christmas — used all the products of rational science (machine guns, poison gas, artillery) to produce industrialized slaughter on an unprecedented scale. The faith that reason = progress = good collapsed for an entire generation.

This is the pressure cooker that produced the intellectual revolution you're studying.

The Scientists & Thinkers

Physics: Dismantling Newton's Clockwork Universe

For ~200 years after Newton, the universe was imagined as a perfect, deterministic machine. If you knew the position and velocity of every particle, you could theoretically calculate all of past and future history. The early 20th century destroyed this idea completely.

  • Max Planck (1900) — Discovered that energy is not continuous but comes in discrete packets called quanta. This was the founding crack in classical physics. Planck himself was uncomfortable with the implications.

  • Albert Einstein — Two world-altering contributions:

    • Special Relativity (1905): Space and time are not absolute — they stretch and compress depending on your velocity relative to another observer. Two people moving at different speeds will measure time passing at different rates. There is no universal "now."

    • General Relativity (1915): Gravity is the curvature of spacetime itself. Space is not a fixed stage on which events happen — it bends.

    • The key takeaway for your LEQ: Einstein showed that time and space are relative to the observer, obliterating the Newtonian idea of a fixed, objective framework for reality.

  • Niels Bohr — Developed the quantum model of the atom and the principle of complementarity: particles like electrons behave as either a wave or a particle depending on how you observe them. The act of observation itself affects reality.

  • Werner Heisenberg (Uncertainty Principle, 1927) — You cannot simultaneously know the exact position and exact momentum of a particle. This is not a limitation of our instruments — it is a fundamental feature of reality. Determinism was mathematically dead.

  • Erwin Schrödinger — Developed wave mechanics and his famous thought experiment (Schrödinger's Cat) to illustrate the absurdity of quantum superposition: a cat in a box is simultaneously alive and dead until observed. Reality is probabilistic, not fixed.

  • Enrico Fermi — Advanced nuclear physics and quantum statistics; eventually central to understanding fission, which would later produce both nuclear power and the atomic bomb — the ultimate symbol of science's double-edged nature.

  • Marie Curie — Discovered radioactivity (polonium, radium), demonstrating that atoms themselves were unstable and transforming — again undermining the idea of matter as solid and knowable. She was also a symbol of women entering rational/scientific fields.

  • Nikola Tesla — Pioneered alternating current (AC) electricity and radio wave transmission, showing that invisible forces could transmit energy and information through space. This felt almost mystical and helped blur the line between the material and immaterial.

Psychology: The Irrational Mind

If physicists were showing that the external universe wasn't as knowable as thought, psychologists were showing the internal self was equally murky.

  • Sigmund Freud — His central argument was that human behavior is driven primarily by the unconscious mind — a reservoir of repressed desires, traumas, and instincts (especially sexual and aggressive ones) that the rational conscious mind cannot access or control. His key works include The Interpretation of Dreams (1900) and Civilization and Its Discontents (1930). For your LEQ: Freud directly attacked the Enlightenment assumption that humans are fundamentally rational actors. We think we reason our way to decisions; actually, we rationalize what our unconscious has already decided.

  • Carl Jung — A student of Freud who broke away and developed his own framework. Jung proposed the collective unconscious — a layer of the mind shared across all humanity, populated by universal archetypes (the Hero, the Shadow, the Anima). This went further than Freud in suggesting human psychology is shaped by forces beyond individual experience or reason, rooted in shared mythological depths.

Philosophy: Truth Under Attack

  • Friedrich Nietzsche — Perhaps the most explosive philosopher of the era. Key ideas:

    • "God is dead" — not a celebration, but a warning: European civilization had built its morality and sense of meaning on Christianity; science and modernity had killed that foundation, but people hadn't yet reckoned with the consequences.

    • Will to Power — human action is driven by a drive for dominance and self-assertion, not reason or morality.

    • Perspectivism — there is no objective truth; every "truth" is a perspective shaped by the interests and position of the one asserting it. This was a direct attack on positivism.

    • The Übermensch (Overman) — since old values had collapsed, individuals must create their own values.

  • Henri Bergson — Argued that reality is fundamentally duration (durée) — a continuous, flowing stream of experience that cannot be chopped up into measurable units without being falsified. Clock time is an artificial imposition; lived time feels completely different (an hour of boredom vs. an hour of joy). His critique targeted the scientific method's obsession with quantification and measurement, arguing it misses the actual texture of experience.

  • Georges Sorel — Applied irrationalism to politics. In Reflections on Violence (1908), he argued that what actually moves people to action is not rational argument but myth — particularly the "myth of the general strike" for the working class. Politics runs on passion and irrational belief, not Enlightenment deliberation. This idea would be horrifyingly confirmed by the mass mobilizations of WWI and later fascism.

Technology & Applied Science: The Positivist Showcase

These represent the other side of the era — the genuine triumphs of rationalism that created the context of confidence before the intellectual crisis hit:

  • Germ Theory (Pasteur, Koch) — Proved that disease was caused by microorganisms, not miasma or divine punishment. Transformed medicine completely.

  • Vaccinations — Building on Jenner, Pasteur developed vaccines for cholera and anthrax. Death rates from infectious disease plummeted.

  • Antiseptics (Lister) — Surgical survival rates skyrocketed when Lister applied germ theory to operating rooms.

  • Quinine — Enabled Europeans to survive malaria in tropical Africa, directly enabling imperial expansion.

  • Steam Engine / Railways — Compressed distance, enabled industrial capitalism and mass troop movement.

  • Automobile — Henry Ford's assembly line (1913) democratized transportation and perfected industrial mass production.

  • Radio (Marconi/Tesla) — Information could now travel invisibly at the speed of light.

  • Public schools & public health — States used scientific/rational governance to educate and medicate populations at scale.

  • WWI Weaponry — Poison gas (chlorine, mustard gas), machine guns, artillery barrages, U-boats, airplanes. The products of rational science weaponized for mass slaughter — this became the central crisis of faith in progress.