Nick McGreivy

Fusion isn't the holy grail of energy

November 9, 2025 · Substack

Compared to fission, fusion is 20 times less powerful, 200 times less sustainable, and way more expensive.

Myths about exploding gradients

August 19, 2025 · Substack

Why tanh activation functions lead to exploding, not vanishing, gradients — and other things your deep learning textbook probably got wrong.

I got fooled by AI-for-science hype — here's what it taught me

May 19, 2025 · Guest post for Understanding AI

A skeptical view of the AI-for-science revolution. Argues that AI has generally been less successful in science than it appears.

General Plasma Physics I (AST551)

PDF · Lecture Notes

Notes from a graduate-level introductory plasma physics course at Princeton University. Hopefully these will be useful for students interested in learning plasma physics or studying for their general exams.

Classical, Neoclassical, and Anomalous Transport (AST568)

PDF · Lecture Notes

Notes from an advanced graduate-level plasma physics course at Princeton University. This draft is incomplete and still requires heavy revision.