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This is the personal website of [Niels G. W. Serup](/about/niels).
Visit the subpages.
**Here's a riddle:**
- What's the difference between a person *X* who studies the [279 Thule
asteroid](https://en.wikipedia.org/wiki/279_Thule) and a person *Y* who
- X is thoughtful. Y just fought Thule.
**(It's a pun.)**