It’s a degree called a Doctor of Philosophy and most senior scientists (but not all) will have done a research project of 3-4 years, written a huge document about it and then been examined on the project and document in order to get this degree.
I think Michael’s covered this pretty well but feel free to comment if you want to know more. I’m mainly posting this so it’s not on my rather long list of unanswered questions 😀
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