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// ls -la ~/posts --sort=date
Science
2026-09-25
Is a Charged Power Bank Heavier Than an Empty One?
E=mc² in the real world: why a charged power bank is about 1.5 nanograms heavier, why incoming electrons are not the reason, how it compares to scale resolution, and the calculation in Python.
cat charged-power-bank-mass.md
Science
2026-08-31
How Did Al-Biruni Measure Earth's Radius with a Mountain?
Reconstructing Al-Biruni's method for computing Earth's radius from a mountain's height and the dip of the horizon: triangulation, the horizon right triangle, and the full calculation in Python.
cat al-biruni-earth-radius.md