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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JAMES O ELLIS</PersonNm>
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      <Form990PartVIISectionAGrp>
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      <Form990PartVIISectionAGrp>
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      <Form990PartVIISectionAGrp>
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      <TotalReportableCompFromOrgAmt>0</TotalReportableCompFromOrgAmt>
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        <Desc>OTHER REVENUE</Desc>
        <BusinessCd>900099</BusinessCd>
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      <GrantsToDomesticOrgsGrp>
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      <OtherExpensesGrp>
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        <Desc>TAXES</Desc>
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        <EndYearBalanceAmt>51351351</EndYearBalanceAmt>
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      <OtherSecuritiesGrp>
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        <BookValueAmt>62854288</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
      </OtherSecuritiesGrp>
      <OtherSecuritiesGrp>
        <Desc>55243.07-TOTAL STOCK MKT IDX ADM (VTSAX)</Desc>
        <BookValueAmt>7790930</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
      </OtherSecuritiesGrp>
      <OtherSecuritiesGrp>
        <Desc>15322.387-VANGUARD GROWTH ETF (VUG)</Desc>
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        <MethodValuationCd>F</MethodValuationCd>
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      <TotalBookValueSecuritiesAmt>76934139</TotalBookValueSecuritiesAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
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      <NetUnrealizedGainsInvstAmt>8921291</NetUnrealizedGainsInvstAmt>
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      <RevenueNotReportedFinclStmtAmt>674315</RevenueNotReportedFinclStmtAmt>
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      <TotExpnsEtcAuditedFinclStmtAmt>9651104</TotExpnsEtcAuditedFinclStmtAmt>
      <OtherExpensesIncludedAmt>4278</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>4278</ExpensesNotReportedAmt>
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      <InvestmentExpensesNotIncld2Amt>678593</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>678593</ExpensesNotRptFinclStmtAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ENDOWMENTS EXIST TO FUND THE ACTIVITIES OF THE NATIONAL ACADEMY OF ENGINEERING. THE ENDOWMENT FUNDS FACILITATE PROGRAMS THAT ADDRESS RELEVANT ISSUES IN THE ENGINEERING FIELD AND ALSO FUND THE DRAPER AND GORDON PRIZES.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FUND IS INCORPORATED UNDER THE DISTRICT OF COLUMBIA NON-PROFIT CORPORATION ACT AND IS EXEMPT FROM INCOME TAXES UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE. IN ADDITION, THE FUND HAS BEEN DETERMINED BY THE INTERNAL REVENUE SERVICE NOT TO BE A PRIVATE FOUNDATION. THE FUND IS REQUIRED TO REMIT INCOME TAXES TO THE FEDERAL GOVERNMENT AND THE DISTRICT OF COLUMBIA FOR UNRELATED BUSINESS INCOME. FOR THE YEAR ENDED DECEMBER 31, 2024, THERE WAS UNRELATED BUSINESS INCOME TAX OF $20,943. THE FUND COMPLIES WITH THE ACCOUNTING STANDARD ON ACCOUNTING FOR UNCERTAINTY IN INCOME TAXES, WHICH ADDRESSES THE DETERMINATION OF WHETHER TAX BENEFITS CLAIMED OR EXPECTED TO BE CLAIMED ON A TAX RETURN SHOULD BE RECORDED IN THE FINANCIAL STATEMENTS. MANAGEMENT EVALUATED THE FUND'S TAX POSITIONS AND CONCLUDED THAT THE FUND HAD TAKEN NO UNCERTAIN TAX POSITIONS THAT REQUIRE ADJUSTMENT TO THE FINANCIAL STATEMENTS TO COMPLY WITH THE PROVISIONS OF THIS GUIDANCE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>CHANGE IN BENEFICIAL INTERESTS IN SPLIT-INTEREST AGREEMENTS 178,113.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XI, LINE 4B - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>COST OF GOODS SOLD REPORTED ON PART VIII LINE 10B -4,278.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART XII, LINE 2D - OTHER ADJUSTMENTS:</FormAndLineReferenceDesc>
        <ExplanationTxt>COST OF GOODS SOLD REPORTED ON PART VIII LINE 10B 4,278.</ExplanationTxt>
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      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>EAST ASIA AND THE PACIFIC</RegionTxt>
        <OfficesCnt>0</OfficesCnt>
        <EmployeeCnt>0</EmployeeCnt>
        <TypeOfActivitiesConductedTxt>GRANT TO RECIPIENT LOCATED IN THE REGION</TypeOfActivitiesConductedTxt>
        <RegionTotalExpendituresAmt>500000</RegionTotalExpendituresAmt>
      </AccountActivitiesOutsideUSGrp>
      <SubtotalOfficesCnt>0</SubtotalOfficesCnt>
      <SubtotalEmployeesCnt>0</SubtotalEmployeesCnt>
      <ContinuationTotalOfficeCnt>0</ContinuationTotalOfficeCnt>
      <ContinuationTotalEmployeeCnt>0</ContinuationTotalEmployeeCnt>
      <TotalOfficeCnt>0</TotalOfficeCnt>
      <TotalEmployeeCnt>0</TotalEmployeeCnt>
      <SubtotalSpentAmt>25862852</SubtotalSpentAmt>
      <ContinuationSpentAmt>0</ContinuationSpentAmt>
      <TotalSpentAmt>25862852</TotalSpentAmt>
      <ForeignIndividualsGrantsGrp>
        <TypeOfAssistanceTxt>2024 CHARLES STARK DRAPER PRIZE</TypeOfAssistanceTxt>
        <RegionTxt>EUROPE (INCLUDING ICELAND &amp; GREENLAND)</RegionTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>500000</CashGrantAmt>
        <MannerOfCashDisbursementTxt>WIRE</MannerOfCashDisbursementTxt>
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      <BoycottCountriesInd>0</BoycottCountriesInd>
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        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL OTHER GRANTS ARE FOR AWARDS GIVEN FOR VARIOUS ENGINEERING ACHIEVEMENTS. EACH AWARD HAS ITS OWN CRITERIA, NOMINATING FORM (WHICH IS ON THE WEBSITE), AND SELECTION COMMITTEE. THE COMMITTEE MEETS SEVERAL TIMES AND REVIEWS THE NOMINATIONS AND MAKES THE FINAL DECISION.</ExplanationTxt>
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          <BusinessNameLine1Txt>NATIONAL ACADEMY OF SCIENCES</BusinessNameLine1Txt>
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          <AddressLine1Txt>2101 CONSTITUTION AVENUE NW</AddressLine1Txt>
          <CityNm>WASHINGTON</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20001</ZIPCd>
        </USAddress>
        <RecipientEIN>530196932</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>5733358</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>SUPPORT FOR NAS PROGRAMS</PurposeOfGrantTxt>
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      <Total501c3OrgCnt>1</Total501c3OrgCnt>
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        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE GRANT TO THE NAS IS TO SUPPORT THE PROGRAMS AND ACTIVITIES OF THE NAE, AS WELL AS SUPPORT FOR CERTAIN PROGRAMS OF THE NAS AND NATIONAL RESEARCH COUNCIL. EXPENSES ARE MONITORED AND REVIEWED ON A MONTHLY BASIS AS WELL AS BEING RECONCILED BY BOTH CORPORATIONS AT THE END OF THE YEAR. ADDITIONALLY BOTH CORPORATIONS HAVE EXTERNAL AUDITORS AND THE NAS HAS INTERNAL AND DCAA AUDITORS ON THE PREMISE DURING THE YEAR.</ExplanationTxt>
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        <CompensationBasedOnRltdOrgsAmt>813493</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>249148</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>64250</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>33808</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>1160699</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <FormAndLineReferenceDesc>PART I, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE NATIONAL ACADEMY OF ENGINEERING FUND DOES NOT COMPENSATE ANY OFFICERS OR DIRECTORS. ALL COMPENSATION SHOWN IN PART VII OF THE FORM 990, AND SCHEDULE J, PAGE 2, PART II, IS PAID BY A RELATED ORGANIZATION OF THE FUND, THE NATIONAL ACADEMY OF SCIENCES (NAS). THE COMPENSATION POLICY OF NAS IS AS FOLLOWS: THE COMPENSATION POLICY OF NAS AS IT RELATED TO NAEF PROVIDES THAT COMPENSATION DECISIONS FOR THE NAE PRESIDENT, A DISQUALIFIED PERSON AS DEFINED IN IRC SECTION 4958, IS MADE ANNUALLY BY THE NAS EXECUTIVE COMPENSATION COMMITTEE COMPOSED OF INDEPENDENT DIRECTORS ON THE BASIS COMPATIBILITY DATA, AND THERE IS A RECORD OF ITS DELIBERATIONS AND DECISIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>10</ContributionCnt>
        <NoncashContributionsRptF990Amt>436658</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <Form8283ReceivedCnt>0</Form8283ReceivedCnt>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>0</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, COLUMN (B):</FormAndLineReferenceDesc>
        <ExplanationTxt>USING THE NUMBER OF CONTRIBUTORS</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH ACTIVE NON-INTERNATIONAL (DOMESTIC) MEMBER OF THE ACADEMY SHALL BE ENTITLED TO VOTE FOR THE ELECTION OF OFFICERS OR COUNCILLORS OF THE ACADEMY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH ACTIVE MEMBER OF THE ACADEMY SHALL BE ENTITLED TO ONE VOTE ON EACH MATTER SUBMITTED TO A VOTE AT ANY MEETING. VOTING ON ALL MATTERS, INCLUDING THE ELECTION OF OFFICERS OR COUNCILLORS, MAY BE CONDUCTED BY WRITTEN DOCUMENT BETWEEN MEETINGS OF THE MEMBERSHIP SO LONG AS THE TOTAL NUMBER OF VOTES CAST IS EQUAL TO OR GREATER THAN THE NUMBER OF VOTING MEMBERS REQUIRED TO CONSTITUTE A QUORUM AT A BUSINESS SESSION OF A STATED OR SPECIAL MEETING. TEN PERCENT OF THE ACTIVE MEMBERS OF THE ACADEMY, PRESENT IN PERSON, SHALL CONSTITUTE A QUORUM FOR ANY BUSINESS SESSION OF A STATED OR SPECIAL MEETING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE DIRECTOR OF FINANCE AND ADMINISTRATION, PRESIDENT AND NAS OFFICE OF GENERAL COUNSEL REVIEW A DRAFT FORM 990 AND DISCUSS QUESTIONS WITH THEIR EXTERNAL ACCOUNTANTS PRIOR TO FINALIZING THE RETURN. THE FORM 990 IS MADE AVAILABLE TO THE BOARD OF TRUSTEES BEFORE FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>EACH YEAR OFFICERS AND TRUSTEES ARE REQUESTED TO COMPLETE A CONFLICT OF INTEREST FORM AND PARTICIPATE IN A BOARD DISCUSSION OF THE NAEF CONFLICT OF INTEREST POLICY AND ANY POTENTIAL CONFLICTS OF AN INDIVIDUAL OFFICERS AND TRUSTEES. IF THERE WAS EVER A CONFLICT, THE BOARD MEMBER WOULD RECUSE HIMSELF.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE NATIONAL ACADEMY OF ENGINEERING FUND (NAEF) DOES NOT COMPENSATE ANY OFFICERS OR DIRECTORS. ALL COMPENSATION SHOWN IN PART VII OF THE FORM 990, AND SCHEDULE J, PAGE 2, PART II, IS PAID BY A RELATED ORGANIZATION OF THE FUND, THE NATIONAL ACADEMY OF SCIENCES (NAS). THE COMPENSATION POLICY OF NAS IS AS FOLLOWS: THE COMPENSATION POLICY OF NAS AS IT RELATED TO NAEF PROVIDES THAT COMPENSATION DECISIONS FOR THE NAE PRESIDENT, A DISQUALIFIED PERSON AS DEFINED IN IRC SECTION 4958, IS MADE ANNUALLY BY THE NAS EXECUTIVE COMPENSATION COMMITTEE COMPOSED OF INDEPENDENT DIRECTORS ON THE BASIS COMPATIBILITY DATA, AND THERE IS A RECORD OF ITS DELIBERATIONS AND DECISIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>AN ANNUAL REPORT CONTAINING THE FINANCIAL STATEMENTS IS POSTED TO THE NAE WEBSITE AND IS AVAILABLE TO THE NAE MEMBERSHIP. THE DEVELOPMENT OFFICE USES IT WHEN FUNDRAISING. THE FINANCIAL STATEMENTS AND GOVERNING DOCUMENTS ARE AVAILABLE TO THE PUBLIC UPON REQUEST FOR THE SAME PERIOD OF DISCLOSURE AS SET FORTH IN SECTION 6104(D).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>CHANGE IN BENEFICIAL INTERESTS IN SPLIT-INTEREST AGREEMENTS 178,113.</ExplanationTxt>
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          <BusinessNameLine1Txt>NATIONAL ACADEMY OF SCIENCES</BusinessNameLine1Txt>
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          <ZIPCd>20418</ZIPCd>
        </USAddress>
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        <PrimaryActivitiesTxt>SCIENTIFIC RESEARCH</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DC</LegalDomicileStateCd>
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        <PublicCharityStatusTxt>LINE 7</PublicCharityStatusTxt>
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          <BusinessNameLine1Txt>THE NATIONAL ACADEMIES CORPORATION</BusinessNameLine1Txt>
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          <ZIPCd>92617</ZIPCd>
        </USAddress>
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        <PrimaryActivitiesTxt>SCIENTIFIC MEETINGS</PrimaryActivitiesTxt>
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        <PublicCharityStatusTxt>LINE 12A, I</PublicCharityStatusTxt>
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      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
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        <FormAndLineReferenceDesc>SCHEDULE R , PAGE 1, PART II, COLUMN (C), LEGAL DOMICILE.</FormAndLineReferenceDesc>
        <ExplanationTxt>THE NATIONAL ACADEMY OF SCIENCES IS A FEDERALLY CHARTERED TAX - EXEMPT CORPORATION ESTABLISHED BY AN ACT OF CONGRESS IN 1863.</ExplanationTxt>
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