Cui 's piano music impressed the audience in that it is beautiful, thought-provoking and easy to understand.

By the mid-19th century scientists had a fair understanding of each of the three components of electromagnetism, as the phenomenon has come to be called.

In response to the increasing burden of chronic eye disease WHO is now developing policies and guidelines for diabetic retinopathy, glaucoma, age-related macular degeneration and refractive errors.