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        <PersonNm>JOHN HENRY</PersonNm>
        <TitleTxt>BOARD MEMBER</TitleTxt>
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        <PersonNm>CATHERINE KEENAN</PersonNm>
        <TitleTxt>BOARD MEMBER</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>NICHOLAS J KOVICH</PersonNm>
        <TitleTxt>BOARD MEMBER</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>LAURIE J LANDEAU</PersonNm>
        <TitleTxt>BOARD MEMBER</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>FRANK LIPIECKI</PersonNm>
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        <PersonNm>FRED A MIDDLETON</PersonNm>
        <TitleTxt>BOARD MEMBER</TitleTxt>
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        <PersonNm>LOUISE Y PALMER</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>OCTAVIO TONATIUH RAMIEREZ-REIVICH</PersonNm>
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        <PersonNm>KATHLEEN SHELTON</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CATHERINE SOHN</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JEFFREY L STURCHIO</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MARY TANNER</PersonNm>
        <TitleTxt>BOARD MEMBER</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CHERYL TEICH</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SAM THARPE</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DAVID COLE</PersonNm>
        <TitleTxt>PRESIDENT &amp; CEO</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>KEVIN CAVANAUGH</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CAITLIN MARTIN</PersonNm>
        <TitleTxt>SECRETARY, DIRECTOR OF COMMUNICATIONS</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MICHELLE DIMEO</PersonNm>
        <TitleTxt>VP OF COLLECTIONS AND PROGRAMS</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>RESA THOMASAON</PersonNm>
        <TitleTxt>EXECUTIVE DIRECTOR, SCI AMERICA</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CHARLES HORNSTEIN</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>PONCE HATCH</PersonNm>
        <TitleTxt>DIRECTOR, END USER EXPERIENCE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BETH ALFARO</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ERIN MCCLEARY</PersonNm>
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      <GrantsToDomesticIndividualsGrp>
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        <ProgramServicesAmt>123860</ProgramServicesAmt>
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        <FundraisingAmt>42143</FundraisingAmt>
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        <ProgramServicesAmt>201106</ProgramServicesAmt>
        <ManagementAndGeneralAmt>51622</ManagementAndGeneralAmt>
        <FundraisingAmt>41168</FundraisingAmt>
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        <ProgramServicesAmt>18808</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5840</ManagementAndGeneralAmt>
        <FundraisingAmt>3157</FundraisingAmt>
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        <ProgramServicesAmt>33673</ProgramServicesAmt>
        <ManagementAndGeneralAmt>9624</ManagementAndGeneralAmt>
        <FundraisingAmt>5653</FundraisingAmt>
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        <ProgramServicesAmt>71629</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4894</ManagementAndGeneralAmt>
        <FundraisingAmt>19536</FundraisingAmt>
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        <ProgramServicesAmt>23864</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4051</ManagementAndGeneralAmt>
        <FundraisingAmt>12401</FundraisingAmt>
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        <ProgramServicesAmt>88106</ProgramServicesAmt>
        <ManagementAndGeneralAmt>27417</ManagementAndGeneralAmt>
        <FundraisingAmt>38238</FundraisingAmt>
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        <ProgramServicesAmt>325402</ProgramServicesAmt>
        <ManagementAndGeneralAmt>56984</ManagementAndGeneralAmt>
        <FundraisingAmt>6907</FundraisingAmt>
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        <ProgramServicesAmt>181097</ProgramServicesAmt>
        <ManagementAndGeneralAmt>26691</ManagementAndGeneralAmt>
        <FundraisingAmt>38839</FundraisingAmt>
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        <ProgramServicesAmt>403585</ProgramServicesAmt>
        <ManagementAndGeneralAmt>23974</ManagementAndGeneralAmt>
        <FundraisingAmt>8705</FundraisingAmt>
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        <ProgramServicesAmt>652582</ProgramServicesAmt>
        <ManagementAndGeneralAmt>51419</ManagementAndGeneralAmt>
        <FundraisingAmt>7183</FundraisingAmt>
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        <ProgramServicesAmt>742429</ProgramServicesAmt>
        <ManagementAndGeneralAmt>92607</ManagementAndGeneralAmt>
        <FundraisingAmt>15860</FundraisingAmt>
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        <ProgramServicesAmt>57645</ProgramServicesAmt>
        <ManagementAndGeneralAmt>13958</ManagementAndGeneralAmt>
        <FundraisingAmt>2437</FundraisingAmt>
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        <TotalAmt>106885</TotalAmt>
        <ProgramServicesAmt>106885</ProgramServicesAmt>
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        <TotalAmt>40507</TotalAmt>
        <ProgramServicesAmt>26616</ProgramServicesAmt>
        <ManagementAndGeneralAmt>9577</ManagementAndGeneralAmt>
        <FundraisingAmt>4314</FundraisingAmt>
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        <TotalAmt>13131</TotalAmt>
        <ProgramServicesAmt>11271</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1860</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
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        <TotalAmt>81</TotalAmt>
        <ProgramServicesAmt>81</ProgramServicesAmt>
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        <TotalAmt>8800420</TotalAmt>
        <ProgramServicesAmt>6660511</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1201677</ManagementAndGeneralAmt>
        <FundraisingAmt>938232</FundraisingAmt>
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        <EOYAmt>3912916</EOYAmt>
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      <PledgesAndGrantsReceivableGrp>
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        <EOYAmt>1406713</EOYAmt>
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        <EOYAmt>97906</EOYAmt>
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        <BOYAmt>19970</BOYAmt>
        <EOYAmt>206850</EOYAmt>
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      <LandBldgEquipAccumDeprecAmt>39658919</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>26641374</BOYAmt>
        <EOYAmt>25436399</EOYAmt>
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      <InvestmentsPubTradedSecGrp>
        <BOYAmt>3253677</BOYAmt>
        <EOYAmt>1646658</EOYAmt>
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        <FormAndLineReferenceDesc>FORM 990, PART I, LINE I, DESCRIPTION OF ORGANIZATION MISSION:</FormAndLineReferenceDesc>
        <ExplanationTxt>WE ARE A LIBRARY AND MUSEUM - WE FOCUS ON BUILDING AND PRESERVING COLLECTIONS IN THE FIELDS OF CHEMISTRY, CHEMICAL ENGINEERING, AND THE LIFE SCIENCES - WE ENABLE EASY ACCESS TO OUR WORLD-CLASS COLLECTIONS - WE INTERPRET OUR COLLECTIONS AND CREATE ENGAGING AUDIENCE EXPERIENCES - WE FOSTER AND CREATE INNOVATIVE HISTORICAL RESEARCH WE ARE STORYTELLERS - WE SHARE THE HISTORY OF SCIENCE USING MULTIPLE STORYTELLING METHODS - WE CHALLENGE DIFFERENT PERSPECTIVES IN THE HISTORY OF SCIENCE - WE REVEAL HOW THE SCIENTIFIC PAST IS EMBEDDED IN OUR DAILY LIVES WE CREATE GLOBAL COMMUNITIES - WE FOSTER VIBRANT COMMUNITIES OF SCHOLARS - WE BUILD AND SUPPORT COMMUNITIES OF THE SCIENTIFICALLY CURIOUS - WE PLACE THE INTERESTS OF OUR AUDIENCES AT THE CENTER OF OUR WORK - WE EMBRACE PHYSICAL AND DIGITAL PLATFORMS - WE EARN THE INTEREST AND PHILANTHROPY OF DONORS, WHO WISH TO SUPPORT MEANINGFUL WORK AT THE INSTITUTE AND MAKE POSITIVE CHANGES IN THE WORLD WE CARE - WE EMBRACE DIVERSITY OF PEOPLE AND PERSPECTIVES - WE SUPPORT AN INCLUSIVE CULTURE - WE IMPLEMENT EQUITABLE POLICIES AND PRACTICES</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>LEWIS GASOREK AND LAURI LANDEAU HAVE A BUSINESS RELATIONSHIP.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THERE IS ONLY ONE CLASS OF MEMBERSHIP TO THE BOARD. BOARD MEMBERS ARE RECOMMENDED BY A COMMITTEE OF THE BOARD AND THOSE RECOMMENDED ARE APPROVED BY THE FULL BOARD. BOARD MEMBERS OF SCIENCE HISTORY INSTITUTE ARE ALSO BOARD MEMBERS OF SCIENCE HISTORY INSTITUTE SUPPORT COMPANY.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>BOARD MEMBERS ARE SELECTED BY THE NOMINATING COMMITTEE OF THE BOARD AND ARE APPROVED BY THE FULL BOARD. THE TWO FOUNDING MEMBER ORGANIZATIONS, AMERICAN CHEMICAL SOCIETY AND THE AMERICAN INSTITUTE OF CHEMICAL ENGINEERS, MAY APPOINT UP TO 5 DIRECTORS IN TOTAL.</ExplanationTxt>
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        <ExplanationTxt>ALL COMMITTEE AND BOARD DECISIONS ARE DOCUMENTED AND RECORDED.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD RECEIVES A COPY AND REVIEWS THE FORM 990 PRIOR TO ITS FILING WITH IRS. RECOMMENDED CHANGES ARE APPROVED PRIOR TO ITS FILING WITH IRS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>SCIENCE HISTORY INSTITUTE HAS A CONFLICT OF INTEREST POLICY WHICH IS REVIEWED ANNUALLY. EACH BOARD MEMBER, OFFICER AND KEY EMPLOYEE ARE REQUIRED TO SUBMIT ANY POTENTIAL CONFLICT TO THE AUDIT COMMITTEE WHICH REVIEWS THE CONFLICT AND THEN SENDS IT ON TO THE FULL BOARD FOR REVIEW AND APPROVAL.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COMPENSATION OF THE PRESIDENT/CEO IS REVIEWED AND APPROVED BY THE EXECUTIVE COMMITTEE AND FULL BOARD AND IS BASED ON COMPARABLE DATA FOR SIMILAR NONPROFIT ORGANIZATIONS. FORM 990, PART VI, LINE 15B (OTHER OFFICER OR KEY EMPLOYEE COMPENSATION): THE PRESIDENT DETERMINES THE COMPENSATION FOR OTHER OFFICERS AND KEY EMPLOYEES USING COMPARABLE ORGANIZATIONS' SALARIES AS A GUIDE BASED ON INFORMATION FROM A CONSULTANT.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 AND ALL OTHER REQUIRED GOVERNING DOCUMENTS ARE AVAILABLE FOR REVIEW.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PAGES 7-8, PART VII:</FormAndLineReferenceDesc>
        <ExplanationTxt>SALARIES FOR ALL EMPLOYEES OF SCIENCE HISTORY INSTITUTE AND SCIENCE HISTORY INSTITUTE SUPPORT COMPANY ARE PAID THROUGH SCIENCE HISTORY INSTITUTE.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>UNCOLLECTIBLE PLEGE -2,336,739.</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PAGE 12, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS A COMITTEE WITH OVERSIGHT OF THE AUDIT OF ITS FINANCIAL STATEMENTS. THIS HAS NOT CHANGED SINCE THE PRIOR YEAR.</ExplanationTxt>
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        <MethodOfAmountDeterminationTxt>INCLUDED IN #1 ABOVE</MethodOfAmountDeterminationTxt>
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          <BusinessNameLine1Txt>SUPPORT FROM SCIENCE HISTORY INSTITUTE SUPPORT COMPANY</BusinessNameLine1Txt>
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        <MethodOfAmountDeterminationTxt>INCLUDED IN #1 ABOVE</MethodOfAmountDeterminationTxt>
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        <MethodOfAmountDeterminationTxt>INCLUDED IN #1 ABOVE</MethodOfAmountDeterminationTxt>
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