1) height weight data.csv:

• male_height
• female_height
• male_weight
• female_weight
• male_bmi
• female_bmi

2) iq.csv:

• iq
• education_expenditure_per_inhabitant
• daily_max_temp

3) life_expectancy.csv:

• male_life_expectancy
• female_life_expectancy
• birth_rate
• death_rate

4) population_density.csv:

• area
• population
• pop_per_km_sq

5) quality of life.csv:

• stability
• rights
• health
• safety
• climate
• costs
• popularity