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The tomte is a creature from scandinavian mythology. It's pretty small, humanoid and has clothes and a beard. They live on farms and in houses where they help out with farmwork and other labour, th...
A parasite starts its first life cycle of youth with the reproductive phase by cloning itself to infect as many people as possible without leaving any signs of its presence. After two days the par...
(First time posting on worldbuilding, be gentle!) For reasons currently unimportant, Earth has been encased in a solid shell which is for all intents and purposes completely invulnerable. The shel...
In humans skin color varies slightly in shades of dark brown to a faded pink, which has the purpose of protecting the skin from sunlight. An idea used commonly by people beginning designing alien i...
I am working a hard science fiction story and I cannot come up with a really good reason to put people on Mars. I need people on Mars for the story to work, but there is no reason for them to be th...
I'm imagining a town in a river valley. The river runs straight through the town and is diverted or spread out into canals that form a grid in the central, low-lying part of the town. Technology is...
Quite simple really. How large can a bat grow before it is too big to fly. I would like a bat with a similar external and internal structure to a real bat just scaled up. I am willing to accept cha...
Imagine that a group of Inuits from Greenland settled in Antarctica; let's say on the Antarctic peninsula, if there is no better place in Antarctica. Could they survive there with their traditiona...
Okay so in my world, I have two pre-industrial societies that live thousands of miles apart from each other on their ringworld. One lives in a desert climate similar to India or the Middle East whi...
Imagine you're on vacation in Greece. It's a nice sunny day, so you decide to go for a swim. The bottom of the sea is full of some greenish-brown ugly seaweed, every stone is covered by some fuzz a...
In the 1989 Batman movie[1], the Joker uses a gas that makes the muscles on your face contract into a "smile" to kill people. My question is simple; is there currently, or is there a way to ...
For context I'm building a post apocalypse world that was in modern age before but storms and tsunamis wiped almost all civilizations off the planet. The question is how huge should civilization ...
Assume in the very near future almost all rail transportation would return to steam-powered locomotives. To define it exactly, I mean solid fuel is burned inside the locomotive, which boils water, ...
Given the chance to bring back from the jurassic any plant, which one would be the most adapted to survive and spread in our actual environment?
I was trying to think of a way to land a spaceship. The best I could think of was a ridiculously long airstrip for landing, and lots of catapults for takeoff, but then there was the problem of havi...
Imagine the following situation: There is a global catastrophe that will destroy the earth and there is a habitable planet in reach for spaceships. But it is technically possible to bring only 50,0...
What would be the impact on modern civilisation be if a benevolent inventor gave the world the ability to travel around the solar system quickly and cheaply. If over the next five years this tech...
Image a world that superficially appears to have Earth-like gravity. However, the moment you do not in any way touch the ground or something else that is touching the ground, there is no gravity fo...
In the story I'm writing, an ancient civilization once roamed the local group, traveling from galaxy to galaxy with ease. Thousands of millennia after their disappearance, humanity stumbles across ...
In a near future society, man will be mining asteroids far from Earth. One technology on board their ships is a hydrocarbon assembler. It takes in energy, water and carbonaceous asteroid matter a...
In my fictional world there are small organisms the size of a dog or smaller,some have the shape of mini-volcanoes, while some are stuck between rocks, they don't move and live in both sea and land...
Some people created synthetic bacterial life forms to use them as fuel producers back then; it's called synthia I believe... and I don't know how it ended up. So creating life is already possible...
I have three planets. Let's call them Un, Deux and Trois. Is it feasible for all three to be orbiting one another, close enough to be seen clearly by eye? All three are large enough to be earth eq...
Inspired by Can we use science to explain a creature that feeds on emotion? I was wondering if we can somehow use science to explain how a creature that devours dreams and nightmares might have c...
In the world I am designing, instead of mammals, birds are the dominant species. In this world, replacing the niche of deer gazelle and cattle are a group of animals known as Quadrabirds. These are...
