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Babies exposed to air pollution during pregnancy take longer to learn to speak, research finds
(www.theguardian.com)
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dart board;; science bs
rule #1: be kind
The sourxe is likely this press release of KCL.
https://www.kcl.ac.uk/news/air-pollution-exposure-in-the-womb-linked-to-worse-language-and-motor-development