Mel, which part is the surprise? I guess I took for granted that I saw the dates posted here and maybe from WTD's mailing list a few months ago. Was Canada still under the impression worlds would be in July or so?

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An aquifer is a water bearing layer of rock or soil. Aquifers are separated by impermeable layers of rock or clay called an aquitard. Aquitard, however may sound a bit offensive to some, and therefore we will be changing the name to Aquachallenge.