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I decided to see how my research has changed over time by making word clouds based on Google Scholar.

Here's what I wrote about from 1985 to 1995. At this early stage of my career I was doing traditional mathematical physics. I got tenure based on my work on quantum and classical field theory - for example, scattering and complete integrability for classical field theories like Yang-Mills theory.

After I got tenure, I got excited about how knot theory is connected to quantum gravity.

By 1995 things had changed....

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