Porta Nigra. This is part two of our travel diary. After a one hour drive through the rural Eifel mountains, you start a seemingly endless descent upon the Moselle Valley to get to Trier. A former Roman town with old ruins, a former summer residence of local royalty, a cathedral in redevelopment for 1500 years and Germany’s oldest city, Trier is rich with history. We didn’t know any of this as it was simply meant to be our stop on our way to Luxembourg, but it is hard to take a walk through the city without noticing. Yet Trier’s most famous son is a controversial historical figure who left to never return before starting any of his far-reaching work. Here is what we can learn from Karl Marx about the exchange value of scientific work in 2016. Continue reading →