Nightfall (50 page)

I
SAAC
A
SIMOV
was the bestselling author of over four hundred and seventy books, on topics ranging from science to Shakespeare. He was best loved for his SF sagas, which include the Foundation and Robot series.

R
OBERT
S
ILVERBERG
has written over seventy SF novels, including the
Majipoor Chronicles
and
Valentine Pontifex
, in addition to several hundred short stories.