Healthcare heroes by Ruby Wallau May 1, 2020 Share Facebook LinkedIn Twitter To honor first responders and healthcare workers, a medical cross has been painted onto the rock in Centennial Common, a landmark on the Boston campus. Photo by Ruby Wallau/Northeastern University To honor first responders and healthcare workers, a medical cross has been painted onto the rock in Centennial Common, a landmark on the Boston campus. Photo by Ruby Wallau/Northeastern University