27
economy
× 2 |
7
survival
× 2 |
3
nuclear-winter
|
1
civilization
|
21
super-powers
× 2 |
6
weapons
|
3
diseases
|
1
biochemistry
|
16
science-based
× 4 |
6
creature-design
|
3
environment
|
1
dystopia
|
16
teleportation
|
5
reality-check
|
3
aliens
|
1
fantasy-races
|
14
telepathy
× 2 |
4
ocean
|
3
colonization
|
1
psychology
|
13
magic
× 3 |
4
isolation
|
2
biology
|
1
low-fantasy
|
13
orbital-mechanics
|
3
society
× 3 |
2
balancing-magic-systems
|
1
hard-science
|
13
planets
|
3
technological-development
× 2 |
2
faster-than-light
|
1
sports
|
12
gods
|
3
technology
× 2 |
2
food
|
1
xenobiology
|
11
warfare
|
3
transportation
|
2
physics
|
0
seasons
|
9
energy
× 2 |
3
scientific-development
|
2
science-fiction
|
0
government
|
8
cybernetics
|
3
manufacturing
|
2
science-in-society
|
0
alternate-earth
|
8
nuclear-power
|
3
nuclear-war
|
1
communication
× 2 |
0
climate
|
Dark Matter
