"Darwin's dice have rolled badly for Earth. The human species is, in a word, an environmental abnormality. Perhaps a law of evolution is that intelligence usually extinguishes itself."

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It is not possible to think of a way of screening out effectively the most appropriate embryos, and hence, what we should expect would be late abortions - either occurring spontaneously or being induced deliberately in the second or third trimester of pregnancy - in order to prevent the birth of abnormal children.

— Ian Wilmut