Faraday had no formal mathematics education — yet he discovered electromagnetic induction, the principle behind every electric motor on earth. His approach was unusual: he reasoned entirely in physical pictures, in mental models of forces and fields, refusing to dress his ideas in the equations that 'real' scientists used. What he lacked in conventional tools, he replaced with ruthless clarity about what he could actually observe and what he was inferring. The philosopher of science William Whewell, who coined the word 'scientist' partly with Faraday in mind, noticed something important here: the history of breakthroughs is full of people who made progress not by acquiring more knowledge, but by becoming painfully honest about the difference between what they knew directly and what they had merely assumed. That distinction — between direct evidence and inherited assumption — is the actual engine of first-principles thinking. It's not about being skeptical or contrarian. It's about noticing, quietly, which parts of your understanding are load-bearing and which are decoration you borrowed from someone else. This Saturday, that's a surprisingly useful thing to audit.

Pick one thing you're confident about in your work or life — what's the difference between what you've directly experienced and what you've taken on faith from others?

Drawing from Philosophy of Science — William Whewell