What does "basic" in the dialogue below mean?
A: "Some version of the Golden Rule can be found in every culture in the world. It's universal."
B: "I guess it really is that basic."
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In common parlance, basic is often used (somewhat figuratively) to mean simple, but in OP's context it's:
basic of, pertaining to, or forming a base; fundamental:
e.g. - a basic principle; the basic ingredient.
Note this usage, which clearly shows that not all basic concepts are simple...
I believe that most neurobiologists and most of contemporary science agree the quantum theory is basic and should be the foundation of neuroscience
To paraphrase Niels Bohr - anyone who thinks quantum theory is simple has not understood it.