What would it be like if Chopin and Beethoven were foreign exchange students at Columbia? At 8 p.m.

The Hudson River is not as dirty as you might think, according to research by the environmental organization Riverkeeper and Columbia University’s Lamont-Doherty Earth Observatory.

A new exchange program uniting students from Columbia University, the Conservatoire de Musique de Paris, and the two Berlin Academies of Music debuts this semester.