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Q&A What efficiencies make a realistic food chain?

The 10% conversion efficiency mentioned in other answers is a decent rule of thumb — there's a lot of variation in the real world, but if you assume that the total prey biomass equals somewhere aro...

posted 10y ago by Ilmari Karonen‭

Answer
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Q&A Creature that increases its own lifespan by killing other animals

An intelligent creature who's natural life span is around 50 years in which they need to feed to not die of starvation after which they naturally die. But killing other beings of their own species...

1 answer  ·  posted 4y ago by Kay‭  ·  last activity 4y ago by Kay‭

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Q&A Superhuman: Extreme Temperatures Pt.2

I have decided I will add my whole question"¦ I'm new give me a bit of grace"¦ I am creating a superhuman and I am in need of some helpful tips and answers. To get straight to the point I need t...

1 answer  ·  posted 4y ago by WhimsyDoesIt‭  ·  last activity 4y ago by WhimsyDoesIt‭

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Q&A What would it take to get the temperature of the human body to rise to 3,000 °F?

I am creating a superhuman that can raise her overall body temperature to 3,000 °F (1648.889 °C) but I need to know the exact requirements of how that could happen. Let's say this superhuman co...

1 answer  ·  posted 4y ago by WhimsyDoesIt‭  ·  last activity 4y ago by WhimsyDoesIt‭

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Q&A How "young" can a non-aging person be and still function?

Vampirism. There are benefits and drawbacks, but one of the benefits is not aging. Great if you get turned in your early twenties, but... what happens if you are turned earlier? Being turned as an...

7 answers  ·  posted 4y ago by Matthew‭  ·  last activity 4y ago by Matthew‭

Question biology
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Q&A What will the abdominal muscles of non-primate humanoids look like?

After looking at concept art of various humanoid creatures portrayed in science fiction I noticed many artists tend to make the abdominal muscles of their creatures/aliens look similar to those mus...

2 answers  ·  posted 4y ago by Pierre ‭  ·  last activity 4y ago by Pierre ‭

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Q&A How could a civilization stay at a medieval tech level for millions of years?

My world has a medieval level civilization that has remained unchanged for millions of years. They look and act a lot like humans; they have language, culture, government, literature, and basic te...

26 answers  ·  posted 4y ago by Alex‭  ·  last activity 4y ago by Alex‭

Question
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Q&A Where would a technologically advanced group of people forced into space by a calamity obtain water from?

The fleet in my setting are forced to leave the planet due to a volatile virus, and leave in pre-prepared spacefaring vessels capable of transporting ten million people per ship. The ships have alg...

7 answers  ·  posted 4y ago by Niobium_Sage‭  ·  last activity 4y ago by Niobium_Sage‭

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Q&A Is the existence of vertically shaped pupils, with a hawk eyesight, biologically possible?

The eyes with vertical pupils of small cats and some reptiles are very good at seeing better in the dark and avoiding being blinded thanks to their ability to regulate the amount of light that ente...

1 answer  ·  posted 4y ago by Mike‭  ·  last activity 4y ago by Mike‭

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Q&A What percentage of stars would need to become Shkadov thrusters to move the whole galaxy?

The advanced civilization in my story is trying to reach as many galaxies as possible in the next few billions years before the expansion of space has sent those galaxies permanently out of reach w...

1 answer  ·  posted 4y ago by RandySavage‭  ·  last activity 4y ago by RandySavage‭

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Q&A Would would occur if a person travelled from a wormhole in flat empty space, to one on Earth?

We are using a Morris-Throne Wormhole Metric. Let's presume the throat of this wormhole (in internal hyperspace) is short, let's say 1km. Now, as you are travelling through the entrance wormhole,...

1 answer  ·  posted 4y ago by MrKred‭  ·  last activity 4y ago by MrKred‭

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Q&A What is the force of impact for a failing space elevator given the following conditions?

The local sapient species on a relatively Earthlike planet has constructed a space elevator. It is anchored along the equator. Due to unfortunate circumstances (and potentially divine intervention)...

2 answers  ·  posted 4y ago by MUSE-42‭  ·  last activity 4y ago by MUSE-42‭

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Q&A Specific gravity change for my world

Ok, so this is a culmination of a few questions into one final question: am I doing this right? I am trying to figure out the gravitational difference from one end of a continent to another. There ...

0 answers  ·  posted 4y ago by NRJohnson‭

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Q&A how big does my creature's organ need to blind or stun predator of all size?

Ok so my creature will look like this They're not big, about 2 feet tall. They're technically amphibians but have the scaly hide of a reptile. They live near the sea. Their life cycle is simila...

4 answers  ·  posted 4y ago by user3556983‭  ·  last activity 4y ago by user3556983‭

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Q&A How much volume does a liquefied human take?

A group of aliens are off to save the human race from extinction caused by a Lovecraftian monstrosity. In order to accomplish this feat, they go to Earth in order to harvest as many humans as po...

8 answers  ·  posted 4y ago by Seraphim‭  ·  last activity 4y ago by Seraphim‭

Question biology mathematics
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Q&A Plausibility of a six limbed, four legged giant

So, I'm creating a fantasy setting, and because why not, I decided to have giants. Not giant giants, just roughly 2 times the height of a human. Now, because physics is dumb, a giant species would ...

2 answers  ·  posted 4y ago by The Humbug‭  ·  last activity 4y ago by The Humbug‭

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Q&A Are there *plausible* planetary conditions where jet aircraft just don't have much advantage over propeller-driven aircraft?

I've seen Which is easier to develop: a piston prop engine or a jet engine? and my own Effects of ~10atm pressure on engine design neither of which answers this. Would different atmospheric densit...

2 answers  ·  posted 4y ago by Tristan Klassen‭  ·  last activity 4y ago by Tristan Klassen‭

Question atmosphere vehicles
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Q&A What laws of physics would need to be broken in order to travel in space faster?

I have a spaceship which I want to have travel very quickly around a system like our own solar system -- let's say about 10 million miles per minute, which would go from Mars to Earth in ~15 minute...

4 answers  ·  posted 4y ago by LukeN‭  ·  last activity 4y ago by LukeN‭

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Q&A What is the best form of powered vehicular flight within a McKendree habitat?

Background A McKendree cylinder is a spinning space habitat in the style of an O'Neill cylinder (below), but orders of magnitude larger. McKendree habitats are hundreds of kilometres in diameter a...

3 answers  ·  posted 4y ago by rek‭  ·  last activity 4y ago by rek‭

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Q&A What events would trigger linguistic hyper-evolution in a spacefaring civilisation?

Let's say that in an alternate universe, humans developed on a relatively small supercontinent, so their languages and cultures were somewhat similar. After a while, all of the nations merged into ...

1 answer  ·  posted 4y ago by System‭  ·  last activity 4y ago by System‭

Question language
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Q&A Humanity is doomed because of succubi

The first two answers in the anatomically correct succubi question suggest a parasitic approach to the concept of succubi which snatches off human organs, either the tongue or the vagina and feed o...

2 answers  ·  posted 4y ago by Kay‭  ·  last activity 4y ago by Kay‭

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Q&A Is my planet realistic?

Is my planet realistic? It doesn't need to be able to support life as it's just another planet in my solar system, but is a planet with such a high density and gravity really possible? I calculated...

4 answers  ·  posted 4y ago by LonelyCryptid‭  ·  last activity 4y ago by LonelyCryptid‭

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Q&A What is the tallest mountain possible in any gravitational environment?

In world building it is often interesting to consider extreme landscapes "“ how tall can a mountain be on Earth for example. But what is the tallest mountain possible in any gravitational environme...

2 answers  ·  posted 4y ago by Slarty‭  ·  last activity 4y ago by Slarty‭

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Q&A toilet for mermaid?

I want to know what kind of toilet design for mermaid is, considering they live surrounded by water and they poop through the anus (or whatever the organs name is) that located in the front rather ...

2 answers  ·  posted 4y ago by Li Jun‭  ·  last activity 4y ago by Li Jun‭

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Q&A Superfluid lifeform

Could a life form that uses superfluids as part of its biology exist? I've read in places that the issue for life outside of Earth and especially the theorised silicon lifeforms is that the existe...

1 answer  ·  posted 4y ago by Nierninwa‭  ·  last activity 4y ago by Nierninwa‭