Question: Where did Christian Ehrenfried Weigel graduate from?
Sentence (from "Christian Ehrenfried Weigel"): Among other things, Weigel developed a cooling heat exchanger (German "Gegenstromkühler") (1771), which was later improved upon by Justus von Liebig and then became to be known as the Liebig condenser ("Liebigkühler").
Relevant evidence: No