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      Constantine the Great produced the Edict of Milan in 313 AD. His mother is known as Saint Helena, and her influence on Constantine is well known. She had her own church in Trier earlier. Constantine later built a bigger church at the place of his mother's church in Trier. This church is called the Basilica of Constantine, and it is still there.

      Many centuries later, Karl Marx was born in Trier (1818). Some people like him but many others do not. In either case, the city of Trier is proud of him.

      What does Marx have to do physics?
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How did he talked to Einstein ?