the.com/macadam
a Scottish surveyor's crushed-stone gospel that paved the planet long before tar showed up.
named afterJohn Loudon McAdam, 1820s road obsessive
original recipecrushed stone, no tar at all
tarmac twistadding tar later birthed the word tarmac
genius trickangular stones lock together under traffic pressure
drainage ruleraised camber so water ran off, not in