Babies are often allergic to cows' milk. A scientific breakthrough means that may no longer be the case.
But is it right for humans to play with nature to such an extent. And could there be some hidden danger ahead?
Reading :
http://wsdownload.bbc.co.uk/learningenglish/pdf/2012/10/121003153201_121004_6min_gm_cows.pdf
Listening:
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