- Islidedownhill,thwackintothetreethatmarkstheboundaryofthenextplot.Ifyourapitwithyourknuckleyouhearthethwackofgypsumratherthantheringofcoldmetal.Gentlyknockonthewatermelonandlistenforahollowsoundthatmakesa"plunk"ratherthana"thwack"sound.AndHenryv,...
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