Things We Believed Before the Scientific Method

What It Covers

Josh Clark and Chuck Bryant trace the origins and mechanics of the scientific method, from pre-Renaissance mysticism through Francis Bacon's framework, covering hypothesis versus theory distinctions, Louis Pasteur's spontaneous generation experiments, Edwin Hubble's galaxy observations, cell theory development, and a modern crisis where only 50% of published biomedical research can be independently replicated.

Key Questions Answered

• •Hypothesis vs. Theory distinction: In scientific language, a theory is not a guess — it is an explanation supported by extensive, independently verified evidence. A hypothesis is the initial testable proposition. Conflating the two, as in "it's just a theory," misrepresents how science works. Evolution and the Big Bang are theories precisely because they have survived repeated testing across decades by independent researchers worldwide.
• •Falsifiability requirement (Karl Popper, 1930s): A hypothesis only qualifies as scientific if it can, in principle, be disproven by observation or measurement. If no conceivable evidence could contradict a claim, it falls outside science's scope. This standard, formalized by philosopher Karl Popper, means supernatural claims like ghosts or God are neither confirmed nor denied by science — they are simply outside its testable domain.
• •Independent and dependent variables in experiments: Controlled experiments require isolating one independent variable — the factor the researcher deliberately changes — while holding all other conditions identical across groups. The dependent variable is what gets measured in response. Pasteur's swan-neck flask experiment exemplifies this: flask shape was the sole variable, allowing him to attribute results specifically to airborne contamination, not random chance.
• •Replication crisis in modern science: Roughly 50% of published research cannot be independently replicated, according to biotech venture capital benchmarks. Amgen reproduced only 6 of 53 landmark cancer studies. The share of published negative results has dropped from over 30% to just 14%, driven by career incentives favoring positive, journal-worthy findings. This "careerism" systematically distorts the scientific record and wastes research funding.
• •Edwin Hubble's inductive reasoning model (1919–1925): Hubble observed nebulae through the Hooker Telescope at Mount Wilson and proposed — against prevailing consensus — that they existed beyond the Milky Way and were moving away from it. This inductive leap, from specific telescope observations to the broad generalization of an expanding multi-galaxy universe, later became foundational to Big Bang cosmology after decades of independent verification by other scientists.
• •Science cannot make value judgments: Researchers can measure, document, and report empirical data — ocean acidification rates, global temperature changes, atmospheric CO2 levels — but the scientific method cannot determine whether those findings are morally good or bad. Asserting that data makes someone a bad person crosses from science into ethics. Conflating the two corrupts scientific credibility and misrepresents what the method is designed to produce.