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        <PersonNm>BILL SCHWARZ</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>ESTHER SWANKER</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>JOHN S WAGNER</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
        <AverageHoursPerWeekRt>1.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>MICHAEL NEWELL</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>WILLIAM MAC SUDDUTH PHD</PersonNm>
        <TitleTxt>PRESIDENT</TitleTxt>
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        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>87278</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>5220</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <TotalReportableCompFromOrgAmt>87278</TotalReportableCompFromOrgAmt>
      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
      <TotalOtherCompensationAmt>5220</TotalOtherCompensationAmt>
      <IndivRcvdGreaterThan100KCnt>0</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>0</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>0</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>EXPLORATORIUM</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PIER 17 SUITE 100</AddressLine1Txt>
            <CityNm>SAN FRANCISCO</CityNm>
            <StateAbbreviationCd>CA</StateAbbreviationCd>
            <ZIPCd>941111455</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>EXHIBIT RENTAL</ServicesDesc>
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      <CntrctRcvdGreaterThan100KCnt>1</CntrctRcvdGreaterThan100KCnt>
      <MembershipDuesAmt>94178</MembershipDuesAmt>
      <GovernmentGrantsAmt>75210</GovernmentGrantsAmt>
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      <TotalContributionsAmt>649076</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>ADMISSIONS</Desc>
        <BusinessCd>900099</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>280261</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>PROGRAM INCOME</Desc>
        <BusinessCd>900099</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>202784</RelatedOrExemptFuncIncomeAmt>
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      <ProgramServiceRevenueGrp>
        <Desc>DUDLEY INCOME</Desc>
        <BusinessCd>900099</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>97792</RelatedOrExemptFuncIncomeAmt>
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      <TotalProgramServiceRevenueAmt>580837</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>30243</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>30243</RelatedOrExemptFuncIncomeAmt>
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      <GrossRentsGrp>
        <RealAmt>2100</RealAmt>
      </GrossRentsGrp>
      <LessRentalExpensesGrp>
        <RealAmt>0</RealAmt>
      </LessRentalExpensesGrp>
      <RentalIncomeOrLossGrp>
        <RealAmt>2100</RealAmt>
      </RentalIncomeOrLossGrp>
      <NetRentalIncomeOrLossGrp>
        <TotalRevenueColumnAmt>2100</TotalRevenueColumnAmt>
        <ExclusionAmt>2100</ExclusionAmt>
      </NetRentalIncomeOrLossGrp>
      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>10384</SecuritiesAmt>
        <OtherAmt>81693</OtherAmt>
      </GrossAmountSalesAssetsGrp>
      <LessCostOthBasisSalesExpnssGrp>
        <SecuritiesAmt>1000</SecuritiesAmt>
        <OtherAmt>1000</OtherAmt>
      </LessCostOthBasisSalesExpnssGrp>
      <GainOrLossGrp>
        <SecuritiesAmt>9384</SecuritiesAmt>
        <OtherAmt>80693</OtherAmt>
      </GainOrLossGrp>
      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>90077</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>80693</RelatedOrExemptFuncIncomeAmt>
        <ExclusionAmt>9384</ExclusionAmt>
      </NetGainOrLossInvestmentsGrp>
      <FundraisingGrossIncomeAmt>101025</FundraisingGrossIncomeAmt>
      <FundraisingDirectExpensesAmt>40794</FundraisingDirectExpensesAmt>
      <NetIncmFromFundraisingEvtGrp>
        <TotalRevenueColumnAmt>60231</TotalRevenueColumnAmt>
        <ExclusionAmt>60231</ExclusionAmt>
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      <OtherRevenueMiscGrp>
        <Desc>MISCELLANEOUS</Desc>
        <BusinessCd>900099</BusinessCd>
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        <RelatedOrExemptFuncIncomeAmt>12555</RelatedOrExemptFuncIncomeAmt>
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      <OtherRevenueTotalAmt>12555</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>1425119</TotalRevenueColumnAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>71715</ExclusionAmt>
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      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>92498</TotalAmt>
        <ProgramServicesAmt>13092</ProgramServicesAmt>
        <ManagementAndGeneralAmt>66314</ManagementAndGeneralAmt>
        <FundraisingAmt>13092</FundraisingAmt>
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      <OtherSalariesAndWagesGrp>
        <TotalAmt>807298</TotalAmt>
        <ProgramServicesAmt>103203</ProgramServicesAmt>
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        <FundraisingAmt>130040</FundraisingAmt>
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      <PensionPlanContributionsGrp>
        <TotalAmt>11972</TotalAmt>
        <ProgramServicesAmt>2235</ProgramServicesAmt>
        <ManagementAndGeneralAmt>6986</ManagementAndGeneralAmt>
        <FundraisingAmt>2751</FundraisingAmt>
      </PensionPlanContributionsGrp>
      <OtherEmployeeBenefitsGrp>
        <TotalAmt>113952</TotalAmt>
        <ProgramServicesAmt>30218</ProgramServicesAmt>
        <ManagementAndGeneralAmt>50368</ManagementAndGeneralAmt>
        <FundraisingAmt>33366</FundraisingAmt>
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      <PayrollTaxesGrp>
        <TotalAmt>67102</TotalAmt>
        <ProgramServicesAmt>8723</ProgramServicesAmt>
        <ManagementAndGeneralAmt>47643</ManagementAndGeneralAmt>
        <FundraisingAmt>10736</FundraisingAmt>
      </PayrollTaxesGrp>
      <FeesForServicesManagementGrp>
        <TotalAmt>45062</TotalAmt>
        <ProgramServicesAmt>15228</ProgramServicesAmt>
        <ManagementAndGeneralAmt>21893</ManagementAndGeneralAmt>
        <FundraisingAmt>7941</FundraisingAmt>
      </FeesForServicesManagementGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>1688</TotalAmt>
        <ProgramServicesAmt>422</ProgramServicesAmt>
        <ManagementAndGeneralAmt>844</ManagementAndGeneralAmt>
        <FundraisingAmt>422</FundraisingAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>78835</TotalAmt>
        <ManagementAndGeneralAmt>78835</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForSrvcInvstMgmntFeesGrp>
        <TotalAmt>10054</TotalAmt>
        <ManagementAndGeneralAmt>10054</ManagementAndGeneralAmt>
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      <AdvertisingGrp>
        <TotalAmt>86433</TotalAmt>
        <ManagementAndGeneralAmt>85164</ManagementAndGeneralAmt>
        <FundraisingAmt>1269</FundraisingAmt>
      </AdvertisingGrp>
      <OfficeExpensesGrp>
        <TotalAmt>121412</TotalAmt>
        <ProgramServicesAmt>72186</ProgramServicesAmt>
        <ManagementAndGeneralAmt>29577</ManagementAndGeneralAmt>
        <FundraisingAmt>19649</FundraisingAmt>
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      <TravelGrp>
        <TotalAmt>15348</TotalAmt>
        <ProgramServicesAmt>10658</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3053</ManagementAndGeneralAmt>
        <FundraisingAmt>1637</FundraisingAmt>
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      <InterestGrp>
        <TotalAmt>22315</TotalAmt>
        <ProgramServicesAmt>13291</ProgramServicesAmt>
        <ManagementAndGeneralAmt>9024</ManagementAndGeneralAmt>
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      <DepreciationDepletionGrp>
        <TotalAmt>161932</TotalAmt>
        <ProgramServicesAmt>121449</ProgramServicesAmt>
        <ManagementAndGeneralAmt>40483</ManagementAndGeneralAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
        <TotalAmt>33877</TotalAmt>
        <ProgramServicesAmt>23839</ProgramServicesAmt>
        <ManagementAndGeneralAmt>7691</ManagementAndGeneralAmt>
        <FundraisingAmt>2347</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>PROGRAM SERVICE EXHIBIT</Desc>
        <TotalAmt>330327</TotalAmt>
        <ProgramServicesAmt>330327</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>PROGRAM SERVICES OTHER</Desc>
        <TotalAmt>74756</TotalAmt>
        <ProgramServicesAmt>74756</ProgramServicesAmt>
        <FundraisingAmt>0</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>MAINTENANCE</Desc>
        <TotalAmt>50733</TotalAmt>
        <ProgramServicesAmt>43822</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4374</ManagementAndGeneralAmt>
        <FundraisingAmt>2537</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>IN-KIND EXPENSES</Desc>
        <TotalAmt>44075</TotalAmt>
        <ProgramServicesAmt>44075</ProgramServicesAmt>
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      <AllOtherExpensesGrp>
        <TotalAmt>41024</TotalAmt>
        <ProgramServicesAmt>41024</ProgramServicesAmt>
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      <TotalFunctionalExpensesGrp>
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        <ProgramServicesAmt>948548</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1036358</ManagementAndGeneralAmt>
        <FundraisingAmt>225787</FundraisingAmt>
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      <CashNonInterestBearingGrp>
        <BOYAmt>2490</BOYAmt>
        <EOYAmt>35216</EOYAmt>
      </CashNonInterestBearingGrp>
      <SavingsAndTempCashInvstGrp>
        <BOYAmt>3377</BOYAmt>
        <EOYAmt>1058</EOYAmt>
      </SavingsAndTempCashInvstGrp>
      <PledgesAndGrantsReceivableGrp>
        <BOYAmt>119744</BOYAmt>
        <EOYAmt>102340</EOYAmt>
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      <AccountsReceivableGrp>
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        <EOYAmt>288667</EOYAmt>
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      <InventoriesForSaleOrUseGrp>
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        <EOYAmt>36112</EOYAmt>
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      <PrepaidExpensesDefrdChargesGrp>
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        <EOYAmt>11831</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipCostOrOtherBssAmt>4899444</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>2990322</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>2017191</BOYAmt>
        <EOYAmt>1909122</EOYAmt>
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      <InvestmentsPubTradedSecGrp>
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        <EOYAmt>1535729</EOYAmt>
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      <InvestmentsOtherSecuritiesGrp>
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        <EOYAmt>118765</EOYAmt>
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      <InvestmentsProgramRelatedGrp>
        <BOYAmt>1</BOYAmt>
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      <TotalAssetsGrp>
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        <EOYAmt>4038840</EOYAmt>
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      <AccountsPayableAccrExpnssGrp>
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        <EOYAmt>538114</EOYAmt>
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      <DeferredRevenueGrp>
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        <EOYAmt>54628</EOYAmt>
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      <MortgNotesPyblScrdInvstPropGrp>
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        <EOYAmt>157500</EOYAmt>
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        <EOYAmt>750242</EOYAmt>
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      <OrganizationFollowsSFAS117Ind>X</OrganizationFollowsSFAS117Ind>
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        <EOYAmt>267389</EOYAmt>
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        <EOYAmt>1273905</EOYAmt>
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      <PermanentlyRstrNetAssetsGrp>
        <BOYAmt>1747304</BOYAmt>
        <EOYAmt>1747304</EOYAmt>
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        <EOYAmt>3288598</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
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        <EOYAmt>4038840</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>-785574</ReconcilationRevenueExpnssAmt>
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      <PriorPeriodAdjustmentsAmt>-13811</PriorPeriodAdjustmentsAmt>
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      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <ConsolidatedBasisFinclStmtInd>X</ConsolidatedBasisFinclStmtInd>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
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    <IRS990ScheduleA documentId="RetDoc1039100001">
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        <CurrentTaxYearMinus3YearsAmt>297064</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>1013339</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>749886</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>649076</CurrentTaxYearAmt>
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      <TotalCalendarYear170Grp>
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        <CurrentTaxYearMinus1YearAmt>33961</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>39627</CurrentTaxYearAmt>
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        <CurrentTaxYearMinus1YearAmt>205039</CurrentTaxYearMinus1YearAmt>
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      <PublicSupportPY170Pct>0.71170</PublicSupportPY170Pct>
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    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1234500001">
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        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
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          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
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    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="RetDoc1040000001">
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      <CollUsedScholarlyRsrchInd>X</CollUsedScholarlyRsrchInd>
      <CollectionUsedPreservationInd>X</CollectionUsedPreservationInd>
      <CollUsedLoanOrExchProgInd>X</CollUsedLoanOrExchProgInd>
      <SolicitedAssetsSaleInd>0</SolicitedAssetsSaleInd>
      <CYEndwmtFundGrp>
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        <EndYearBalanceAmt>1747304</EndYearBalanceAmt>
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      <CYMinus1YrEndwmtFundGrp>
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      <CYMinus2YrEndwmtFundGrp>
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        <EndYearBalanceAmt>1747304</EndYearBalanceAmt>
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      <CYMinus3YrEndwmtFundGrp>
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        <EndYearBalanceAmt>1747304</EndYearBalanceAmt>
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      <CYMinus4YrEndwmtFundGrp>
        <BeginningYearBalanceAmt>1747304</BeginningYearBalanceAmt>
        <EndYearBalanceAmt>1747304</EndYearBalanceAmt>
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      <EndowmentsHeldUnrelatedOrgInd>1</EndowmentsHeldUnrelatedOrgInd>
      <EndowmentsHeldRelatedOrgInd>0</EndowmentsHeldRelatedOrgInd>
      <LandGrp>
        <OtherCostOrOtherBasisAmt>368040</OtherCostOrOtherBasisAmt>
        <BookValueAmt>368040</BookValueAmt>
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      <LeaseholdImprovementsGrp>
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      <EquipmentGrp>
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      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>576418</OtherCostOrOtherBasisAmt>
        <BookValueAmt>576418</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>1909122</TotalBookValueLandBuildingsAmt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 1A:</FormAndLineReferenceDesc>
        <ExplanationTxt>COLLECTIONS THE MUSEUMS'S COLLECTIONS ARE MADE UP OF ARTIFACTS OF HISTORICAL, CULTURAL, OR SCIENTIFIC SIGNIFICANCE THAT ARE HELD FOR EDUCATIONAL, RESEARCH, SCIENTIFIC, OR CURATORIAL PURPOSES. EACH OF THE ITEMS IS CATALOGED, PRESERVED, AND CARED FOR, AND ACTIVITIES VERIFYING THEIR EXISTENCE AND ASSESSING THEIR CONDITION ARE PERFORMED CONTINUOUSLY. THE COLLECTIONS ARE SUBJECT TO A POLICY THAT REQUIRES PROCEEDS FROM THEIR SALES TO BE USED FOR THE IMPROVEMENT AND MAINTENANCE OF EXISTING COLLECTIONS. IN ACCORDANCE WITH THE PRACTICE GENERALLY FOLLOWED BY MUSEUMS, THE VALUE OF OBJECTS IN THE COLLECTIONS IS EXCLUDED FROM THE FINANCIAL STATEMENTS; COLLECTIONS ARE REFLECTED IN THE ACCOMPANYING FINANCIAL STATEMENTS AT A NOMINAL VALUE OF $1. SINCE THE MUSEUM'S INCEPTION, SUCH COLLECTIONS WERE ACQUIRED PRIMARILY THROUGH CONTRIBUTIONS. PURCHASES OF COLLECTION ITEMS ARE RECORDED AS DECREASES IN UNRESTRICTED NET ASSETS IN THE YEAR IN WHICH THE ITEMS ARE ACQUIRED OR AS DECREASES IN TEMPORARILY RESTRICTED NET ASSETS, IF THE ASSETS USED TO PURCHASE THE ITEMS ARE RESTRICTED BY DONORS. CONTRIBUTED COLLECTION ITEMS ARE NOT REFLECTED IN THE FINANCIAL STATEMENTS. PROCEEDS FROM DEACCESSIONS OR INSURANCE RECOVERIES ARE REFLECTED AS INCREASES IN NET ASSETS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>INCOME FROM ENDOWMENT FUND IS TO BE USED FOR OPERATING PURPOSES.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleG documentId="RetDoc1041300001">
      <FundraisingEventInformationGrp>
        <Event1Nm>ANNUAL GALA</Event1Nm>
        <GrossReceiptsEvent1Amt>101025</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>0</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>101025</GrossRevenueEvent1Amt>
        <FoodAndBeverageEvent1Amt>17985</FoodAndBeverageEvent1Amt>
        <OtherDirectExpensesEvent1Amt>22809</OtherDirectExpensesEvent1Amt>
        <GrossReceiptsTotalAmt>101025</GrossReceiptsTotalAmt>
        <GrossRevenueTotalEventsAmt>101025</GrossRevenueTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>17985</FoodAndBeverageTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>22809</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>40794</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>60231</NetIncomeSummaryAmt>
      </FundraisingEventInformationGrp>
    </IRS990ScheduleG>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <HistoricalArtifactsGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>19</ContributionCnt>
        <MethodOfDeterminingRevenuesTxt>MUSEUM DOES NOT RECOGNIZ</MethodOfDeterminingRevenuesTxt>
      </HistoricalArtifactsGrp>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>1</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 32B:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MUSEUM HIRED AN UNRELATED AUCTION HOUSE TO SELL PREVIOUSLY ACCESSIONED ITEMS THAT DO NOT FIT THE ORGANIZATION'S MISSION OF INSPIRING A SENSE OF WONDER ABOUT EXTRAORDINARY SCIENTIFIC AND TECHNOLOGICAL DEVELOPMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 33:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MUSEUM DOES NOT VALUE THEIR HISTORICAL ARTIFACTS AND THEREFORE DOES NOT COUNT THEM AS REVENUE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MUSEUM HAS DUES PAYING MEMBERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE DRAFT 990 IS FIRST REVIEWED IN DETAIL BY THE MUSEUM'S DIRECTOR OF FINANCE AND THE EXECUTIVE DIRECTOR. ANY CHANGES, COMMENTS AND QUESTIONS ARE REVIEWED WITH THE TAX PREPARER. A REVISED DRAFT IS COMPLETED AND FORWARDED TO THE FINANCE COMMITTEE, COMPRISED OF MEMBERS OF THE GOVERNING BODY, FOR THEIR APPROVAL AND SUBMISSION TO THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>TRUSTEES SIGN A CONFLICT OF INTEREST POLICY YEARLY AND PROVIDE A SUMMARY OF ALL DISCLOSED CONFLICTS TO THE BOARD OF TRUSTEES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>COMPARISON TO 2 INDUSTRY SALARY GUIDES AND THEN APPROVED BY FINANCE AND EXECUTIVE COMMITTEES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>AVAILABLE UPON REQUEST AND CAN ALSO BE ACCESSED AT WWW.GUIDESTAR.ORG</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>NO CHANGE FROM PRIOR YEAR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 24A:</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL LOBBYING EXPENSES ARE REFLECTED IN PART IX, STATEMENT OF FUNCTIONAL EXPENSES, IN THE SCIENCE CENTER PLANNING INCLUDED ON LINE 24A, AS THEY PERTAIN TO THE MUSEUM'S PLANS FOR BUILDING A NEW SCIENCE CENTER.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>