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Re natural experiment: what about the water pipes? Were they exchanged as well? I don’t think you can see this as natural experiment unless other factors are eq
by baxtr 8y ago
Re natural experiment: what about the water pipes? Were they exchanged as well? I don’t think you can see this as natural experiment unless other factors are equal
- telchar 8y agoTFA discusses a natural experiment with water pipes. Cities near lead production centers tend to have lead pipes, so they compared cities with that characteristic and acidic water (which leaches lead into the water) and such cities without acidic water. The study found a strong effect.