Hypothesis: most researchers get fewer international invitations than Timothy Gowers.

Conclusion: most researchers don’t need to fly.

Caveat: this is a lot easier in countries with functional railways and active research communities. Which is why academics in these countries must lead the way.
Reposted from Timothy Gowers
Now that it's 2025, I can celebrate having got through 2024 without flying. To do this I had to turn down a number of interesting invitations, and I also made three trips by train (two to the south of France and one to Berlin) that would have been cheaper and quicker to do by plane.

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