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        <BusinessCd>561520</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>66540</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
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      <RoyaltiesRevenueGrp>
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        <RelatedOrExemptFuncIncomeAmt>1508</RelatedOrExemptFuncIncomeAmt>
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      <GrossRentsGrp>
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      <RentalIncomeOrLossGrp>
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      <NetRentalIncomeOrLossGrp>
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      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>98609</SecuritiesAmt>
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      <LessCostOthBasisSalesExpnssGrp>
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      <GainOrLossGrp>
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      <NetGainOrLossInvestmentsGrp>
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      <NetIncomeFromGamingGrp>
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      </NetIncomeFromGamingGrp>
      <GrossSalesOfInventoryAmt>523</GrossSalesOfInventoryAmt>
      <CostOfGoodsSoldAmt>185</CostOfGoodsSoldAmt>
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      <FeesForServicesLobbyingGrp>
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      <FeesForServicesProfFundraising>
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      <InformationTechnologyGrp>
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        <FundraisingAmt>7249</FundraisingAmt>
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        <ManagementAndGeneralAmt>77849</ManagementAndGeneralAmt>
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        <ManagementAndGeneralAmt>5524</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
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        <ManagementAndGeneralAmt>798</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
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        <ProgramServicesAmt>924</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1597</ManagementAndGeneralAmt>
        <FundraisingAmt>9066</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>Shared cost allocation</Desc>
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        <ProgramServicesAmt>85065</ProgramServicesAmt>
        <ManagementAndGeneralAmt>-94996</ManagementAndGeneralAmt>
        <FundraisingAmt>9931</FundraisingAmt>
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      <ReceivablesFromOfficersEtcGrp>
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      <LandBldgEquipCostOrOtherBssAmt>5911</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>3681</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
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      <InvestmentsPubTradedSecGrp>
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      <InvestmentsOtherSecuritiesGrp>
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      <InvestmentsProgramRelatedGrp>
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      <OtherAssetsTotalGrp>
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      <TotalAssetsGrp>
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      <OrganizationFollowsSFAS117Ind>X</OrganizationFollowsSFAS117Ind>
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      <ReconcilationRevenueExpnssAmt>-11674</ReconcilationRevenueExpnssAmt>
      <NetUnrlzdGainsLossesInvstAmt>186233</NetUnrlzdGainsLossesInvstAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>true</FSAuditedInd>
      <FSAuditedBasisGrp>
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      <TotalCalendarYear170Grp>
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        <CurrentTaxYearMinus3YearsAmt>1185978</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>973183</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1490360</CurrentTaxYearMinus1YearAmt>
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        <TotalAmt>5879485</TotalAmt>
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      <SubstantialContributorsTotAmt>1188004</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>4691481</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>60020</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>116989</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>22738</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>34570</CurrentTaxYearMinus1YearAmt>
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        <TotalAmt>284749</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <UnrelatedBusinessNetIncm170Grp>
        <TotalAmt>0</TotalAmt>
      </UnrelatedBusinessNetIncm170Grp>
      <OtherIncome170Grp>
        <CurrentTaxYearMinus1YearAmt>912</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>9762</CurrentTaxYearAmt>
        <TotalAmt>10674</TotalAmt>
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      <TotalSupportAmt>6174908</TotalSupportAmt>
      <GrossReceiptsRltdActivitiesAmt>442655</GrossReceiptsRltdActivitiesAmt>
      <PublicSupportCY170Pct>0.75980</PublicSupportCY170Pct>
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        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
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        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
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          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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        <InvestmentEarningsOrLossesAmt>253472</InvestmentEarningsOrLossesAmt>
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      <CYMinus1YrEndwmtFundGrp>
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        <EndYearBalanceAmt>1704609</EndYearBalanceAmt>
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      <CYMinus2YrEndwmtFundGrp>
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        <EndYearBalanceAmt>1739420</EndYearBalanceAmt>
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        <DepreciationAmt>3681</DepreciationAmt>
        <BookValueAmt>2230</BookValueAmt>
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      <TotalRevEtcAuditedFinclStmtAmt>1476420</TotalRevEtcAuditedFinclStmtAmt>
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      <RevenueNotReportedAmt>186233</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>1290187</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>1290187</TotalRevenuePerForm990Amt>
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      <ExpensesSubtotalAmt>1301861</ExpensesSubtotalAmt>
      <TotalExpensesPerForm990Amt>1301861</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part V, Line 4: Intended uses of the endowment fund.</FormAndLineReferenceDesc>
        <ExplanationTxt>NCSE has designated a portion of its unrestricted net assets as a general endowment fund to support the mission of the Organization. Since the endowment resulted from an internal designation and is not donor-restricted, it is classified and reported as unrestricted net assets. Each year, the Organization is authorized to withdraw up to 5 of the average balance of the stock and securities portfolio investment account over the prior three years. Market value to be determined as of the last business day of the preceding year for the organization's operating purposes. The dollar amount and timing of any distributions from the investment account will be left up to the discretion of the Executive Director and the Treasurer.</ExplanationTxt>
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      <SupplementalNonqualRtrPlanInd>false</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>false</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>false</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>false</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>false</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>false</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>false</InitialContractExceptionInd>
      <RebuttablePresumptionProcInd>false</RebuttablePresumptionProcInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Ann Reid</PersonNm>
        <TitleTxt>Executive Dir.</TitleTxt>
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        <DeferredCompensationFlngOrgAmt>8057</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>17653</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>194734</TotalCompensationFilingOrgAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4d: Other Program Services Description</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER PROGRAM SERVICES 4: OUTREACH AND EDUCATION: NCSE provided information to teachers, parents, the press and the general public related to creation/evolution and climate change controversies. NCSE staff members were quoted in stories and articles in major media outlets. Staff delivered lectures, workshops, and presentations. NCSE exhibited at several annual meetings of national and state scientific and educational societies. The quarterly print newsletter, Reports of NCSE was distributed to 4,000 homes. NCSE's weekly informational e-blast had 6,000 subscribers. In 2017, NCSE had more than 200,000 Facebook fans and 10,000 Twitter followers.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 6: Explanation of Classes of Members or Shareholder</FormAndLineReferenceDesc>
        <ExplanationTxt>Members receive quarterly newsletters. They have no voting rights.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b: Form 990 Review Process</FormAndLineReferenceDesc>
        <ExplanationTxt>The 990 is sent to all board members. It is reviewed by both the Executive Director and the board Treasurer prior to filing. The Director of Operations submits the 990 to the Executive Director and board Treasure with comments to explain information and responds to questions prior to filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c: Explanation of Monitoring and Enforcement of Conflicts</FormAndLineReferenceDesc>
        <ExplanationTxt>The board of directors members sign a conflict of interest statement each year. NCSE has not had a conflict so there has never been any discussion about prohibitions.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a: Compensation Review &amp; Approval Process - CEO, Top Management</FormAndLineReferenceDesc>
        <ExplanationTxt>In 2017 research was done by contacting other similar organization in the Bay Area to obtain information about the organizations' Executive Director salaries. An independent survey was also used that compares salary data from other non-profits.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19: Other Organization Documents Publicly Available</FormAndLineReferenceDesc>
        <ExplanationTxt>NCSE makes its governing documents, conflict of interest policy and financial statements available upon request. The organization makes its completed 990 form available upon request and uploads it onto the GuideStar and Charity Navigator websites.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>