Hobbyist/dilettante into Relativity (from Aristotle onwards), self-taught, very selectively.
Specializing in SR visualization, GR geodesics, and aspects of learning/teaching the subject, including the "Twin Paradox".
Solving ODEs using Taylor Series and "automated" detection of chaotic solutions
Kerr orbits (for particles and light) using Symplectic integrators
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Keeping a low profile.
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