How GPS finds you and lets Google send you adverts

If both Special and General Relativity didn’t work precisely as Einstein said it did, GPS would be far less accurate than it actually is. Like, way off, meaning those auto-drive cars wouldn’t even get to the right road. Or any road. And we’d all be lost. Let me explain. GPS works by very precise distance … More How GPS finds you and lets Google send you adverts

When power assertion is disguised by the rules…

There was a headline the other week on the Fairfax news site ‘Stuff’ about a southern New Zealand high school that was forbidding children to wear warm headgear – beanies – despite temperatures dropping into the negatives. Based on the report it appeared to me to be simple power assertion. Beanies weren’t in the uniform, … More When power assertion is disguised by the rules…