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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>MANAGEMENT HAS EVALUATED THE EFFECT OF GUIDANCE SURROUNDING UNCERTAIN INCOME TAX POSITIONS AND CONCLUDED THAT THE FOUNDATION HAS NO SIGNIFICANT FINANCIAL STATEMENT EXPOSURE TO UNCERTAIN INCOME TAX POSITIONS AT JUNE 30, 2023. THE FOUNDATION IS NOT CURRENTLY UNDER AUDIT BY ANY TAX JURISDICTION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 IS PREPARED BY A CERTIFIED PUBLIC ACCOUNTANT. THE EXECUTIVE DIRECTOR, TREASURER, AND ACCOUNTING MANAGER REVIEW FORM 990. IT IS THEN FORWARDED TO THE INTERNAL AFFAIRS COMMITTEE AND BOARD OF DIRECTORS FOR FINAL REVIEW AND SUBSEQUENTLY FILED WITH THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD OF DIRECTORS MONITORS COMPLIANCE WITH THE CONFLICT OF INTEREST POLICY, WHICH REQUIRES BOARD MEMBERS AND MANAGEMENT TO FILE A DISCLOSURE STATEMENT AT LEAST ANNUALLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD'S EXECUTIVE COMMITTEE EVALUATES THE COMPENSATION AND PERFORMANCE OF THE EXECUTIVE DIRECTOR. INDUSTRY REPORTS AND MARKET DATA ARE USED TO DETERMINE SALARY. OTHER OFFICERS ARE NOT COMPENSATED. THERE WERE NO KEY EMPLOYEES DURING FISCAL YEAR ENDING 6/30/23.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VIII, LINE 2A: PROGRAM SERVICE REVENUE</FormAndLineReferenceDesc>
        <ExplanationTxt>EXHIBIT SUPPORT FOR $1,072,423 - NORTHERN VIRGINIA SCIENCE CENTER FOUNDATION ("THE FOUNDATION") ENTERED INTO AN AGREEMENT ("3-PARTY AGREEMENT"), AMENDED ON MARCH 23, 2023, WITH THE SCIENCE MUSEUM OF VIRGINIA, A STATE AGENCY OF THE COMMONWEALTH OF VIRGINIA ("SMV"), AND THE LOUDOUN COUNTY BOARD OF SUPERVISORS, A POLITICAL SUBDIVISION OF THE COMMONWEALTH OF VIRGINIA ("LOUDOUN"), FOR THE DEVELOPMENT AND OPERATION OF THE NEW SCIENCE CENTER. THE TOTAL COST OF THE PROJECT IS PLANNED TO BE $107.5 MILLION. SMV WILL EXPEND APPROXIMATELY $71.5 MILLION TO DESIGN AND CONSTRUCT THE NEW FACILITY. LOUDOUN WILL PROVIDE THE FOUNDATION WITH $15 MILLION, TO BE USED TO DESIGN AND FABRICATE THE MUSEUM EXHIBITS. THE FOUNDATION IS ACCOUNTING FOR THE FUNDS IT RECEIVES FROM LOUDOUN AS AN EXCHANGE TRANSACTION AND RECOGNIZING AS PROGRAM SERVICES REVENUE IN EACH ACCOUNTING PERIOD TO THE EXTENT OF COSTS INCURRED FROM THE CONTRACTED EXHIBIT DESIGN-BUILD FIRM, ROTO.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER PROFESSIONAL FEES: PROGRAM SERVICE EXPENSES 339,463. MANAGEMENT AND GENERAL EXPENSES 27,303. FUNDRAISING EXPENSES 9,487. TOTAL EXPENSES 376,253.</ExplanationTxt>
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    </IRS990ScheduleO>
  </ReturnData>
</Return>
