- countries go through phases of development
- demographic transition~ as a pre industrial society -> industrial -> post industrial
- industrialization -> the society being changed/improved
- big movement from rural -> cities from industrialization
- get closer to jobs in cities
- birth and death rate are lower
- Russia = weird pyramid due to WW2
- Hans Rosling
- teaches global health
- 1810
- life expectancy: 40 or less
- UK + Netherlands were higher
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