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        <ExplanationTxt>SCHEDULE A, PART II, LINE 10, EXPLANATION FOR OTHER INCOME,INVENTORY SALES2014 AMOUNT, $387,804.2015 AMOUNT, $801,210.2016 AMOUNT, $830,825.2017 AMOUNT, $880,390.2018 AMOUNT, $902,300.2019 AMOUNT, $902,497</ExplanationTxt>
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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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      <FootnoteTextInd>X</FootnoteTextInd>
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      <NetUnrealizedGainsInvstAmt>373774</NetUnrealizedGainsInvstAmt>
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        <FormAndLineReferenceDesc>Part X : FIN48 Footnote</FormAndLineReferenceDesc>
        <ExplanationTxt>The Foundation is organized as a not-for-profit organization and is exempt from income taxes under section 501(c)(3) of the Internal Revenue Code. Unrelated business income, of which the Foundation had none for the years ended December 31, 2019 and 2018, would be subject to federal income taxes. The Foundation's information returns filed with the Internal Revenue Service have not been examined in the past. The Foundation is not aware of any uncertainties that could jeopardize its not-for-profit status. Therefore, no provision or liability for income taxes is deemed necessary. The Foundation follows the provisions of uncertain tax positions addressed by FAS ASC 740-10 Accounting for Uncertainty in Income Taxes. The Foundation has no uncertain tax positions at December 31, 2019, for which the ultimate deductibility is highly certain but for which there is uncertainty about the timing of such deductibility. The Foundation recognizes interest accrued related to unrecognized tax benefits in interest expense and penalties in operating expense. The Foundation has determined that no amount is required to be accrued for taxes or related penalties and interest for any tax position taken through December 31, 2019.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Part XI, Line 2d: Other revenue amounts included in F/S but not included on form 990</FormAndLineReferenceDesc>
        <ExplanationTxt>COGS RELATED TO INVENTROY SALES ON PG 9 $0 NET ASSETS RELEASED FROM RESTRICTIONS $304738</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 2d: Other expenses and losses per audited F/S</FormAndLineReferenceDesc>
        <ExplanationTxt>COGS related to Inventory Sales on Pg 9 $321529</ExplanationTxt>
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          <AddressLine1Txt>649 15TH AVENUE</AddressLine1Txt>
          <CityNm>SAN FRANCISCO</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>94118</ZIPCd>
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        <RecipientEIN>464861410</RecipientEIN>
        <CashGrantAmt>12000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>TO SUPPORT LOST LANDSCAPE</PurposeOfGrantTxt>
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      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
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      <SupplementalNonqualRtrPlanInd>false</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
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        <PersonNm>ALEXANDER ROSE</PersonNm>
        <TitleTxt>Executive Dir.</TitleTxt>
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        <DeferredCompensationFlngOrgAmt>5511</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>240</NontaxableBenefitsFilingOrgAmt>
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        <Desc>CRYPTOCURRENCY</Desc>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4d: Other Program Services Description</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER PROGRAM SERVICES 4: NEVADA - THE FOUNDATION IS COMMITTED TO DEVELOPING THIS SITE AS A 10,000 YEAR INSTALLATION IN PARALLEL WITH THE 10,000 YEAR CLOCK IN TEXAS. OTHER PROGRAM SERVICES 5: THE ROSETTA PROJECT - THE ROSETTA PROJECT IS A GLOBAL COLLABORATION OF LANGUAGE SPECIALIST AND NATIVE SPEAKERS WORKING TO BUILD A PUBLICLY ACCESSIBLE DIGITAL LIBRARY OF HUMAN LANGUAGES. OTHER PROGRAM SERVICES 6: PANLEX - THIS PROJECT IS FOUNDED ON THE IDEA THAT EVERY PERSON HAS THE FUNDAMENTAL RIGHT TO USE THEIR OWN LANGUAGE AND TO NOT HAVE OTHER RIGHTS ABRIDGED BECAUSE OF IT. AMONG THE WORLDS 7,000 HUMAN LANGUAGES, THERE IS A GROWING DIVIDE BETWEEN WHAT IS AVAILABLE TO SPEAKERS OF MAJOR LANGUAGES AND UNDER-SERVED LANGUAGES. TO HELP OVERCOME LANGUAGE BARRIERS TO HUMAN RIGHTS, INFORMATION, AND OPPORTUNITIES, PANLEX IS MAKING IT POSSIBLE TO TRANSLATE ANY WORD FROM ANY LANGUAGE INTO ANY OTHER LANGUAGE. HIGH-QUALITY COMMUNICATION ACROSS LANGUAGES USUALLY REQUIRES MORE THAN TRANSLATING JUST WORDS, BUT WORD TRANSLATION IS ONE OF ITS MAIN PREREQUISITES. The PanLex project was set up in 2012 with dedicated investments and the option to operate off of investment income, or to spend down those investments as needed to support project activities. OTHER PROGRAM SERVICES 7: SEMINARS ABOUT LONG-TERM THINKING - THE LONG NOW FOUNDATION'S MONTHLY SEMINARS WERE STARTED IN 2003 TO BUILD A COMPELLING BODY OF IDEAS ABOUT LONG-TERM THINKING; TO HELP NUDGE CIVILIZATION TOWARD OUR GOAL OF MAKING LONG-TERM THINKING AUTOMATIC AND COMMON INSTEAD OF DIFFICULT AND RARE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b: Form 990 Review Process</FormAndLineReferenceDesc>
        <ExplanationTxt>The Executive Director and Board review the 990 before filing.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c: Explanation of Monitoring and Enforcement of Conflicts</FormAndLineReferenceDesc>
        <ExplanationTxt>All Trustees, Directors, Officers, and Key Employees are required to sign a Conflict of Interest policy. It is the policy of the Board that the existence of any interests that give rise to conflict be disclosed on a timely basis and always before any transaction is consummated. It shall be the continuing responsibility of the Board, officers, and management employees to scrutinize their transactions and outside business interests and relationships for potential conflicts and to immediately make such disclosures. Board member disclosures should be made to a Board officer and staff disclosures should be made to the chief executive. The Board shall determine whether a conflict exists and is material, and in the presence of an existing material conflict, whether the contemplated transaction may be authorized as just, fair, and reasonable to Long Now. The decision of the BOard on these matters will rest in their sole discretion, and their concern must be the welfare of Long Now and the advancement of its purpose.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15a: Compensation Review &amp; Approval Process - CEO, Top Management</FormAndLineReferenceDesc>
        <ExplanationTxt>The Executive Director compensation is based on Board review and comparison data with other Northern California nonprofit organizations.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 15b: Compensation Review and Approval Process for Officers and Key Employees</FormAndLineReferenceDesc>
        <ExplanationTxt>BOARD MEMBERS DO NOT RECEIVE FINANCIAL COMPENSATION FOR BEING ON THE BOARD. BOARD MEMBERS MAY BE COMPENSATED FOR SPECIFIC SERVICES THEY PROVIDE FOR THE ORGANIZATION, SUCH AS HOSTING AND CURATING A PUBLIC SPEAKING SERIES. COMPENSATION FOR KEY EMPLOYEES IS RECOMMENDED BY THE EXECUTIVE DIRECTOR AND REVIEWED BY THE BOARD OF DIRECTORS.</ExplanationTxt>
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        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19: Other Organization Documents Publicly Available</FormAndLineReferenceDesc>
        <ExplanationTxt>The Long Now Foundation's 990s are available through Guidestar (www.guidestar.org). All other governing documents are available by request as per applicable laws.</ExplanationTxt>
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</Return>