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A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

× 113
For questions about the process of moving en masse to a new area.
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For questions related to the production of certain types of food: plants, nuts and everything else that is edible and cultivated.
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For questions about bodies of salt water large enough to sustain their own internal currents and do not drain to any larger body of water. Covers both currents, navigation, and ecology.
× 111
For questions about the mechanical processes that allow organisms to live, including respiration, consumption, excretion. Focus on shapes of body parts and connections between parts.
× 111
For questions that have to do with the science or practice of drawing maps. If the question has to do with making maps this question is good. Note: This tag is about creating maps of physical features…
× 108
For questions about technology that works with sizes of less than 100 nanometres, often the manipulation of individual molecules.
× 107
for questions which are about temperature, heat and their effects on the environment, the heat of astronomical objects, living beings, things, and space and what it might be like.
× 106
For questions of Earth\humans that extrapolate beyond available data: hundreds of years at least, thousands commonly, millions preferably.
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For questions asking about current or future normal behavior in a given society.
× 102
For questions about the abundance, usage, etc. of metals.
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For questions discussing some level of self-awareness.
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For questions about gods, the creation of gods, their characteristics, and the effects they have on worlds.
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For questions about the ability to live forever.
× 99
for questions relating to radically changed Earth. This alternate Earth could be a post-apocalyptic Earth, or Earth with major changes in the current social/political/economical schemes.
× 98
the scientific analysis and study of interactions among organisms and their environment.
× 98
For questions concerning electromagnetic radiation in the visible spectrum.
× 97
Concerning the entire universe, the universe itself, and alternate or parallel universes.
× 96
For creatures with a central nervous system, this represents the major organ of that system. For humans and other terrestrial vertebrates, the brain is housed in the head and encased in bone.
× 94
For questions relating to both people dying and people who have died.
× 94
For questions relating to water-based vessels. Ships in space should use the spaceship tag.
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Concerning dimensions of space and time, whether our 3-space + 1-time or other dimensions.
× 92
For questions dealing with acts that violate the laws of a given legislation.
× 89
For questions taking place in a medieval setting similar to culture and technology to medieval Europe.
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For questions that have to do with means of commercial exchange other than barter.
× 88
For questions involving large flying objects that are lighter than air.
× 88
For questions about the characteristics of living beings in different settings. This tag is not for questions about the daily life of characters.
× 87
For questions based in worlds where technology is typically steam-powered rather than based on electricity.
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For questions about naturally occurring phenomena that cause damage and threat to a sentient being, e.g. tornadoes, earthquakes, meteors, etc.
× 85
For questions regarding clothes (and other related possessions) and trends of a culture.
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For questions about the interactions and relationships between multiple different species.
× 84
For questions about the process of developing scientific discoveries and what prerequisites are needed for different types of discoveries.
× 83
For questions about extremely large artificial structures, including buildings.
× 83
For questions regarding the day-night cycle of a day on a world. Usually regarding the dark-light cycle.
× 83
For questions dealing with things that happen beneath the surface of the planet or other celestial body, except for things that happen in water (use [underwater] for that).
× 82
For questions about aquatic creatures traditionally resembling humans but with a fish tail instead of legs, or any sort of water-dwelling humanoid.
× 82
For questions relating to sexual reproduction and the physical acts of mating that sexual beings engage in.