Physics
Grind a magnet fine enough and it stops being a magnet. Nothing about the material has changed
13 Sept 2026 · 11 min read
Below a certain size a magnetic particle can no longer hold its own direction — room-temperature heat flips it faster than you can measure. That single effect explains ferrofluids, MRI contrast agents, every DNA extraction kit, and why hard drives stopped growing the way they used to.
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