Exploring geospatial link between soils and national intelligence quotient.

Area of Science:

• Environmental Science
• Human Geography
• Nutritional Science

Background:

• Published maps show a spatial link between soil fertility and mean national intelligence quotient (MNIQ).
• This suggests soil nutrition could impact human intellectual capacity globally.
• Investigating this relationship requires a worldwide perspective.

Purpose of the Study:

• To examine the spatial relationships between soil fertility and MNIQ across 126 countries.
• To determine if soil nutritional factors influence human intellectual capacity on a global scale.
• To analyze the correlation and spatial interrelation between soil fertility and MNIQ.

Main Methods:

• Developed a soil fertility index (SFI) using soil type and pH data.
• Employed regression, correlation, and geostatistical methods (semivariograms) for analysis.
• Assessed spatial interrelations between MNIQ and SFI.

Main Results:

• A significant positive correlation (r=0.58, P<0.001) was found between SFI and MNIQ.
• Soil fertility accounted for 34% of the variability in MNIQ.
• Similar spatial patterns in semivariograms suggest shared processes influencing both soil fertility and IQ.

Conclusions:

• Soil fertility is a significant factor associated with global human intellectual capacity.
• Complex interplay exists between soil, nutrition, and intelligence, influenced by socioeconomic and cultural factors.
• Interdisciplinary collaboration is essential for a comprehensive understanding of this relationship.