Reason: None provided.
The air is cleaner than it's ever been. Pollution in the 70's and 80's in urban areas was serious. Where were the heart problems in children then?
2 years ago
2 score
Reason: Original
The air is cleaner than it's ever been. Pollution in the 70's and 80's in urban areas was serious. Where were the heart problems then?
2 years ago
1 score