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        <InvestmentEarningsOrLossesAmt>174119</InvestmentEarningsOrLossesAmt>
        <EndYearBalanceAmt>2560182</EndYearBalanceAmt>
      </CYMinus3YrEndwmtFundGrp>
      <CYMinus4YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>2317254</BeginningYearBalanceAmt>
        <ContributionsAmt>11242</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>245904</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>200000</OtherExpendituresAmt>
        <EndYearBalanceAmt>2374400</EndYearBalanceAmt>
      </CYMinus4YrEndwmtFundGrp>
      <BoardDesignatedBalanceEOYPct>1.00000</BoardDesignatedBalanceEOYPct>
      <EndowmentsHeldUnrelatedOrgInd>false</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>false</EndowmentsHeldRelatedOrgInd>
      <RelatedOrgListSchRInd>false</RelatedOrgListSchRInd>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>12083</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>12083</DepreciationAmt>
      </EquipmentGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>Lease Liability</Desc>
        <Amt>85954</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>85954</TotalLiabilityAmt>
      <TotalRevEtcAuditedFinclStmtAmt>1453944</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>124976</NetUnrealizedGainsInvstAmt>
      <DonatedServicesAndUseFcltsAmt>11220</DonatedServicesAndUseFcltsAmt>
      <OtherRevenueAmt>-21889</OtherRevenueAmt>
      <RevenueNotReportedAmt>114307</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>1339637</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>1339637</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>1583438</TotExpnsEtcAuditedFinclStmtAmt>
      <DonatedServicesUseFcltsAmt>11220</DonatedServicesUseFcltsAmt>
      <ExpensesNotReportedAmt>11220</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>1572218</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>21889</InvestmentExpensesNotIncld2Amt>
      <ExpensesNotRptFinclStmtAmt>21889</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>1594107</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part V, Line 4: Intended uses of the endowment fund.</FormAndLineReferenceDesc>
        <ExplanationTxt>Each year, the Organization is authorized to withdraw up to 4% of the average balance of the stock and securities portfolio investment account over the prior five 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. The Organization may request additional spending on an as needed basis to add to the general funds available for possible new initiatives.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleJ documentId="IRS990ScheduleJ" softwareId="24020486" softwareVersionNum="2024v5.2">
      <IndependentConsultantInd>X</IndependentConsultantInd>
      <WrittenEmploymentContractInd>X</WrittenEmploymentContractInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>false</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>false</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>false</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>false</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>false</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>false</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>false</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>false</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Amanda Townley</PersonNm>
        <TitleTxt>Executive Dir.</TitleTxt>
        <BaseCompensationFilingOrgAmt>172633</BaseCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>349</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>349</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>173331</TotalCompensationFilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Ann Reid</PersonNm>
        <TitleTxt>Former Executive Director</TitleTxt>
        <BaseCompensationFilingOrgAmt>9637</BaseCompensationFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>9637</TotalCompensationFilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="24020486" softwareVersionNum="2024v5.2">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 8b</FormAndLineReferenceDesc>
        <ExplanationTxt>While the board has subcommittees, these committees are not authorized to act on behalf of the board.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The 990 is reviewed first by the Finance committee and then sent out with any accompanying notes to the full board members to also review.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Each Board member signs an annual confict of interest statement that would document any conflicts.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15a</FormAndLineReferenceDesc>
        <ExplanationTxt>Research was done by contacting other similar organization in the Bay area to discuss ED salaries. A independent survey was also used, that compares salary data from other non-profits. This process occurred in 2022 and early 2025.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</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, GuideStar, on the NCSE website and Charity Navigator websites.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4a - Program Service Accomplishments</FormAndLineReferenceDesc>
        <ExplanationTxt>Science Education Outreach - (continued from page 2) NCSE staff presented at large-scale conferences hosted by groups such as the National Association of Biology Teachers, as well as at the local school and district level. In 2024, the SEO team led professional development sessions at 14 local school districts, 11 state conferences, and 5 national conferences. In all, the team worked in 14 states with over 1,800 teachers. The program also launched an innovative professional development model called My COAST (Climate-Oriented Authentic Science Teaching) in which NCSE partners with local institutions to provide an immersive, hands-on experience for teachers on the impacts of climate change on coastal ecosystems. The Science Education Outreach program also continued to send its monthly educator newsletter with resources and other items of interest to more than 6,000 subscribers.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4b - Program Service Accomplishments</FormAndLineReferenceDesc>
        <ExplanationTxt>Communications - (continued from page 2) We began a presence on TikTok and Bluesky and increased our presence on Instagram, all with the purpose of increasing awareness of our organization. We also began developing more video content for use on social media and on our YouTube channel. We continued to send our monthly e-newsletter, which had a subscriber list of about 25,000. We also email a quarterly digital publication to our supporters, Reports of the National Center for Science Education. The high-production, 16-page PDF includes news about our programs, our members, and other articles of interest. NCSE's work was featured in external media such as Forbes, Science, Scientific American, and The New York Times.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4d - Other Program Services Description</FormAndLineReferenceDesc>
        <ExplanationTxt>In 2024, our core programs continued to work towards fulfilling our mission of ensuring an accurate and effective evolution and climate science education for all students in the nation.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>