Collection of essays:

Past:
Unity
The scientist as unbeliever
The choking grip
Human mutations
The hollow earth
Poison!
Competition!
Benjamin Franklin changes the world
Fifty years of astronomy
The myth of the machine

Present:
The perennial fringe
The case against 'Star Wars'
Short term; long term
The useful ivory tower
Do it first!
Popularizing science
The pace of research
The brain
Darwin and natural selection
Cool light
Halley's Comet
destination space
Ice in orbit
Looking for our neighbors
Life is wherever it lands
Einstein's theory of relativity
What is the universe made of?
Science and science fiction
The dark vision
The lure of horror
Movie science
Book into movie
My hollywood non-career
I love New York
The immortal Sherlock Holmes
Gilbert & Sullivan
Mensa and I
Write, write, write
Facing up to it
Triple bypass

Future:
The elevator effect
2084
Society in the future
Feminism for survival
TV and the race with doom
The next seventy years in the courts
The future of costume
The immortal word
Liberty in the next century
The villain in the atmosphere
The new learning
Technology, you, your family, and the future
Should we fear the future?
Should we fear the computer?
Work changes its meaning
Nuclear dreams and nightmares
The new tools in space
Living on the moon, parts I and II
The skies of luna
The solar system for humanity
The clinical lab of the future
The hospital of the future
Medicine from space
Revising the pattern
Putting bacteria to work
Fiddling with genes