It was shown by Maurice Wilkins of King's College to James Watson at the Cavendish Laboratory in Cambridge, who said "my mouth fell open and my pulse began to race".

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But Lisa Watson of Monsanto cautioned that the Cornell study was conducted under laboratory conditions and may not accurately reflect Bt's impact in farm fields.

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It will be exactly 60 years ago in February that James Watson and Francis Crick famously burst into the pub next to their Cambridge laboratory to announce the discovery of the "secret of life".

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Like Watson, Horton believed the fastest and cheapest way to aid poor countries was to turn existing laboratory compounds into new drugs.

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