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3 “... water distribution systems has never been greater. The American Association of Civil Engineers in 2009...”

4 “... water distribution systems has never been greater. The American Association of Civil Engineers in 2009...”

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15 “..., and other selective chemical weapons has had enormous health and economic benefits; not for nothing were...”

16 “..., and other selective chemical weapons has had enormous health and economic benefits; not for nothing were...”

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19 “.... Every once in a while, one of these researchers has an 'a-ha' moment: "this discovery could be used...”

20 “.... Every once in a while, one of these researchers has an 'a-ha' moment: "this discovery could be used...”