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        <ExplanationTxt>ALZHEIMERS DISEASE DATA INITIATIVE INC HAS TWO MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7a Members or stockholders electing members of governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MEMBERS OF THE ORGANIZATION HAVE THE RIGHT TO APPOINT AND REMOVE THE DIRECTORS OF THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7b Decisions requiring approval by members or stockholders</FormAndLineReferenceDesc>
        <ExplanationTxt>MEMBERS HAVE THE POWER TO APPOINT SUCCESSOR MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b Review of form 990 by governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>THE DRAFT RETURN IS REVIEWED BY THE FINANCE AND LEGAL FUNCTIONS AND APPROVED BY THE SECRETARY AND TREASURER. A FINAL VERSION OF THE FORM IS MADE AVAILABLE TO THE BOARD BEFORE FILING WITH THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c Conflict of interest policy</FormAndLineReferenceDesc>
        <ExplanationTxt>THE CONFLICT OF INTEREST POLICY APPLIES TO DIRECTORS, OFFICERS AND KEY EMPLOYEES. THEY ARE REQUIRED TO DISCLOSE POTENTIAL CONFLICTS WITH RESPECT TO ANY TRANSACTION TO THE BOARD OF DIRECTORS, OR A COMMITTEE THEREOF, WHICH DETERMINES IF THERE IS A CONFLICT. IF THERE IS A CONFLICT, THE PERSON WITH THE CONFLICT MUST REFRAIN FROM ATTEMPTING TO INFLUENCE DECISIONS REGARDING THE TRANSACTION AND IS NOT PERMITTED TO PARTICIPATE IN DISCUSSIONS OF THE TRANSACTION EXCEPT TO RESPOND TO REQUESTS FOR INFORMATION ABOUT THE TRANSACTION. DIRECTORS, OFFICERS AND KEY EMPLOYEES ARE REQUIRED TO ANNUALLY COMPLETE STATEMENTS DISCLOSING FAMILY MEMBERS AND RELATED ENTITIES WHO MAY DO BUSINESS WITH THE ORGANIZATION. THESE STATEMENTS ARE REVIEWED BY THE ORGANIZATION'S LEGAL COUNSEL AND ARE AVAILABLE FOR INSPECTION BY MEMBERS OF THE BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19 Required documents available to the public</FormAndLineReferenceDesc>
        <ExplanationTxt>These documents are not available for public inspection</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9 Other changes in net assets or fund balances</FormAndLineReferenceDesc>
        <ExplanationTxt>RETURN OF PREVIOUSLY REPORTED GRANTS - 494997;</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="IRS990ScheduleR" softwareId="23017437" softwareVersionNum="2023v5.1">
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>BREAKTHROUGH ENERGY CATALYST FOUNDATION</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>PO BOX 563</AddressLine1Txt>
          <CityNm>KIRKLAND</CityNm>
          <StateAbbreviationCd>WA</StateAbbreviationCd>
          <ZIPCd>98083</ZIPCd>
        </USAddress>
        <EIN>853677542</EIN>
        <PrimaryActivitiesTxt>SCIENTIFIC</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DE</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>7</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>true</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>BREAKTHROUGH ENERGY ACTION INC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>PO BOX 563</AddressLine1Txt>
          <CityNm>KIRKLAND</CityNm>
          <StateAbbreviationCd>WA</StateAbbreviationCd>
          <ZIPCd>98083</ZIPCd>
        </USAddress>
        <EIN>853694865</EIN>
        <PrimaryActivitiesTxt>ADVOCACY</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DE</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(4)</ExemptCodeSectionTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
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      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>BREAKTHROUGH ENERGY FOUNDATION</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>PO BOX 563</AddressLine1Txt>
          <CityNm>KIRKLAND</CityNm>
          <StateAbbreviationCd>WA</StateAbbreviationCd>
          <ZIPCd>98083</ZIPCd>
        </USAddress>
        <EIN>853672460</EIN>
        <PrimaryActivitiesTxt>SCIENTIFIC</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DE</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>7</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
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        <ControlledOrganizationInd>true</ControlledOrganizationInd>
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      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>BREAKTHROUGH ENERGY CATALYST EUROPE SARL</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <EIN>981758246</EIN>
        <PrimaryActivitiesTxt>OTHER FINANCIAL VEHICLES</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>LU</LegalDomicileForeignCountryCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>NA</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <EntityTypeTxt>C Corporation</EntityTypeTxt>
      </IdRelatedOrgTxblCorpTrGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>false</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>false</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>false</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>false</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>false</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>false</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>false</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>false</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>false</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>false</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>false</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>false</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>false</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>false</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>false</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>false</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>false</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>false</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>false</TransferFromOtherOrgInd>
    </IRS990ScheduleR>
  </ReturnData>
</Return>