An 8-minute explainer on the Kakeya needle problem and Fourier restriction: disk, triangle and deltoid areas, Besicovitch/Perron trees shrinking the area, dimension by box counting, tubes in higher dimensions, how one-pitch waves form beams along tubes, and the local smoothing -> Bochner-Riesz -> restriction -> Kakeya chain. Ends with OpenAI's October 2026 claims (local smoothing, Kakeya and restriction in every dimension), which have not yet been independently verified. Areas, box counts and waves computed in Python.