DiggingforInformation

Theresearchersduglongrectangles.Theydugdeepenoughtofindclues.Insomeplaces,thesoilwasdarkerthanthedirtaroundit.Washingtonusedrich,darksoilforplanting.Itwasmorefertile.

Theteamfoundseedsandpollen.Theytestedtheminalaboratory.TheylearnedwhichplantsWashington planted.