Re: "Happy 90th Birthday, Robert Silverberg!"

I knew him, as a kid, for "The Lost Race of Mars." (He really should
have set that in the 22nd century, IMO. Or the 23rd.) He also wrote a
lot of nonfiction, for those who don't know.
What I posted on his 80th birthday:
https://groups.google.com/g/rec.arts.sf.written/c/9njGlro_DF0/m/uOc-w89QQasJ
Excerpt:
 "The Great Doctors" (nonfiction) is still intriguing even today, IMO.
That's where I found out that the myth of the medical demigod Asclepius
may have been based on a real man from circa 1400 B.C.!