Infact
91 / 100
True

All mammals over 3 kg take about 21 seconds to pee due to the physics of urethra scaling.

Infact verdict: True (91/100).

The claims regarding urination time and urethra scaling in mammals are supported by multiple high-quality sources. Research from Georgia Tech, which won an Ig Nobel prize, confirms that mammals over 3 kg take approximately 21 seconds to urinate. This is due to the scaling of urethras in larger animals, which allows for consistent urination duration across different sizes. The evidence is robust, with multiple studies corroborating these findings.

September 30, 2026 Language: en 2 claims analyzed
How is this score determined? →

Individual claims

91
True Science
All mammals weighing over 3 kg take approximately 21 seconds to pee.
Multiple high-quality sources, including a study from Georgia Tech, confirm that mammals over 3 kg take about 21 seconds to urinate. This research was awarded an Ig Nobel prize, indicating its recognition and credibility.
Fact Check Score None
Fact Check Weight 0
Web Consensus Score 90
Web Consensus Weight 40
Source Quality Score 85
Source Quality Weight 20
Llm Reasoning Score 80
Llm Reasoning Weight 40
Llm Reasoning Score Raw 80
Weighted Total 91
Evidence Summary 3 high-quality sources confirm the claim.
91
True Science
The physics of wider and longer urethras in larger animals scales perfectly.
The claim is supported by research showing that larger animals have longer urethras, which increases hydrostatic pressure and flow rate, allowing them to urinate in the same duration as smaller animals. This is corroborated by multiple studies from reputable sources.
Fact Check Score None
Fact Check Weight 0
Web Consensus Score 90
Web Consensus Weight 40
Source Quality Score 85
Source Quality Weight 20
Llm Reasoning Score 80
Llm Reasoning Weight 40
Llm Reasoning Score Raw 80
Weighted Total 91
Evidence Summary 3 high-quality sources confirm the claim.

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