Below is everything (newest at top) with "education+history+measurements+" in its title or subcategories.
SOMETHING TO PONDER( education / history / measurements )
Railroad tracksThe US standard railroad gauge (distance between the rails) is 4 feet, 8.5 inches. That's an exceedingly odd number. Why was that gauge used? Because that's the way they built them in England, and English expatriates designed the US railroads. Why did the English build them like that? Because the first rail ... read more