<p>SEOUL, South Korea — On May 5, 1818, in the southern German town of Trier, in the picturesque wine-growing region of the Moselle Valley, Karl Marx was born. At the time Trier was one-tenth the size it is today, with a population of around 12,000. According to one of Marx’s recent biographers, Jürgen Neffe, Trier is one of those towns where “although everyone doesn’t know everyone, many know a lot about many.”</p>