My ancient history professor, Martin Ostwald, taught me all about Athens in the golden age, the fifth century B.C. -- and more. Somehow he circled back to me early in the year 2024 A.D. His seminar of four students met once a week, Thursday afternoons, for time travel that raced like chariots. Famous in his field, the pipe-smoking German Jew lavished wisdom on us. I remember each face and name…