Pochemy.net
health_and_safety Human Body

why is it that flies seem to appear out of thin air so quickly (even indoors) when rotten things or feces are nearby?

Dr. Aris Thorne
Dr. Aris Thorne
Senior Science Editor · Jan 23, 2026 · Updated Apr 13, 2026

Fun fact, up until recently in modern history people simply believed that things like garbage and feces spontaneously generated life because like you said, it seems like there are no flies, then trash and boom, hella flies. The truth is a little more boring and gross, it's simply that flies and m…

92
Words

1 min
Read Time

#132
of 500 in Human Body

+33%
vs Category Avg

The Short Answer

Fun fact, up until recently in modern history people simply believed that things like garbage and feces spontaneously generated life because like you said, it seems like there are no flies, then trash and boom, hella flies. The truth is a little more boring and gross, it's simply that flies and maggots are all around you all the time, and they just congregate quickly. Since they have a fairly short life cycle and make tons of babies, it only takes a few days for a handful of flies to become a swarm.

Analysis

Key Concepts: Flies, simply, life

This explanation focuses on flies, simply, life and spans 92 words across 3 sentences. At 33% above the average Human Body explanation (69 words), this is one of the more thorough answers in this category, reflecting the complexity of the underlying question.

What This Answer Covers

The explanation opens with: “Fun fact, up until recently in modern history people simply believed that things like garbage and feces spontaneously ge” It then elaborates by explaining the root cause, ultimately building toward a complete picture across 3 connected points.

How This Compares in Human Body

Ranked #132 of 500 Human Body questions by answer depth (top 27%). This falls in the detailed tier — above average depth. The explanation goes beyond surface-level but keeps things accessible.

Frequently Asked Questions

Is there a simple explanation for why it that flies seem to appear out of thin air so quickly (even indoors) when rotten things or feces are nearby?

Fun fact, up until recently in modern history people simply believed that things like garbage and feces spontaneously generated life because like you said, it seems like there are no flies, then trash and boom, hella flies. The truth is a little…

How detailed is this explanation compared to similar Human Body questions?

This is an above-average answer at 92 words, ranked #132 of 500 Human Body questions by depth. The key concepts covered are flies, simply, life.

What approach does this answer take to explain it that flies seem to appear out of thin air so quickly (eve?

The explanation uses root cause analysis across 92 words. It is categorized under Human Body and addresses the question through 1 analytical lens.