Polish Jews maintained ties with other Diaspora Jews and kept up with world events and life in other Jewish communities via Yiddish, Hebrew, and Polish newspapers; public lectures by visiting notables; and correspondence with family and friends overseas. Of particular interest were events in Palestine, both causes of celebration, such as the founding of Hebrew University in Jerusalem in 1925, and tragedies, such as the 1929 riots known as the "Hebron massacre," in which 67 Jews were killed.