90
science-based
× 17 |
12
technological-development
|
6
economy
|
3
spaceships
|
34
reality-check
× 11 |
11
warfare
× 3 |
6
anatomy
|
3
shipbuilding
|
31
science-fiction
× 4 |
10
space
× 2 |
6
psychology
|
3
united-states
|
24
alternate-worlds
× 2 |
9
food
× 3 |
5
engineering
× 2 |
2
tactics
|
24
worldbuilding-process
|
9
geology
|
5
empire-building
|
2
space-warfare
|
23
planets
× 3 |
9
weather
|
5
medicine
|
2
near-future
|
22
environment
× 4 |
8
evolution
× 4 |
3
creature-design
× 3 |
2
brain
|
22
culture
× 2 |
8
faster-than-light
|
3
alternate-history
|
2
age-of-sail
|
15
biology
× 4 |
8
time
|
3
bones
|
2
combat
|
14
technology
× 2 |
7
weapons
× 4 |
3
artificial-intelligence
|
2
dragons
|
14
currency
|
7
aliens
× 3 |
3
biochemistry
|
2
dyson-spheres
|
12
earth-like
× 2 |
7
fire
|
3
military-defense
|
1
magic
× 2 |
12
climate
|
7
flora
|
3
fuels
|
1
xenobiology
× 2 |
thanby
