26
science-based
× 14 |
5
steampunk
|
3
materials
|
1
planets
× 2 |
26
reality-check
× 9 |
4
ecology
× 3 |
3
travel
|
1
radiation
|
20
biology
× 10 |
4
espionage
|
3
ships
|
1
physics
|
16
creature-design
× 7 |
4
flying-machines
|
3
medieval
|
1
wild-west
|
13
evolution
× 7 |
4
government
|
3
medieval-europe
|
1
underground
|
13
deserts
|
4
microgravity
|
3
metals
|
1
space-warfare
|
13
history
|
3
technology
× 4 |
3
mythical-creatures
|
1
spaceships
|
13
kingdom
|
3
xenobiology
× 3 |
2
aliens
× 3 |
1
super-powers
|
13
natural-resources
|
3
warfare
× 2 |
2
space-travel
× 2 |
1
anatomy
|
6
fantasy-races
|
3
hard-science
× 2 |
2
viruses
|
1
architecture
|
5
magic
× 4 |
3
environment
× 2 |
2
military-defense
|
1
communication
|
5
military
× 2 |
3
chemistry
× 2 |
2
health
|
1
engineering
|
5
science-fiction
× 2 |
3
clothing
× 2 |
1
dragons
× 2 |
1
far-future
|
David G.
