Resistance to new ideas
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Max Planck: 'A new scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it.'
What's the relationship between the resistance to new ideas, credulism, and the certainty of belief?
For example, evolution by natural selection, plate tectonics, Earth's orbit of the Sun instead of the reverse, geological timescales, and so on.
Consider the irony that credulism, and the certainty of belief, have role in the resistance to credulism and the certainty of belief.