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      <Form990ScheduleDPartXIV>
        <ReturnReference>PART III, LINE 4:</ReturnReference>
        <Explanation>AT THIS POINT, THE MOMATH TEAM HAS DESIGNED AND IS IN THE PROCESS OF FABRICATING OVER FORTY STATE-OF-THE-ART HANDS-ON EXHIBITS WHICH BRING OUT THE WONDERS OF MATHEMATICS. INTERESTED PARTIES CAN LEARN MORE AT HTTP://MOMATH.ORG (THE WEBSITE OF THE MUSEUM OF MATHEMATICS). THE MATH MIDWAY (MATHMIDWAY.ORG) IS A TRAVELING EXHIBITION DESIGNED FOR USE IN SCIENCE CENTERS AND MUSEUMS, CELEBRATING THE WONDERS OF MATHEMATICS. IT CONSISTS OF TWENTY HANDS-ON, INTERACTIVE EXHIBITS, EACH ALLOWING VISITORS THE OPPORTUNITY TO EXPLORE A MATHEMATICAL CONCEPT AND DISCOVER SURPRISING PRINCIPLES OR PHENOMENA. THE MOST IMPORTANT ACTIVITY OF THE MUSEUM OF MATHEMATICS (MOMATH) IS TO PREPARE TO OPEN A STATE-OF-THE-ART INNOVATIVE VISITOR CENTER IN MANHATTAN. THIS PHYSICAL MUSEUM WILL BE THE ONLY INSTITUTION OF ITS KIND IN NORTH AMERICA, AND THE ONLY HANDS-ON SCIENCE CENTER IN MANHATTAN, NY. FILLED WITH INTERACTIVE EXHIBITS THAT ALLOW OPEN-ENDED EXPLORATION AND SURPRISING DISCOVERIES, THE MUSEUM WILL FINALLY PROVIDE A PLACE WHERE KIDS AND ADULTS CAN GO TO BECOME EXCITED ABOUT MATHEMATICS.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>DESCRIPTION OF UNCERTAIN TAX POSITIONS UNDER FIN 48:</Identifier>
        <ReturnReference>PART X:</ReturnReference>
        <Explanation>THE MUSEUM RECOGNIZES THE EFFECT OF INCOME TAX POSITIONS ONLY IF THOSE POSITIONS ARE MORE LIKELY THAN NOT OF BEING SUSTAINED. MANAGEMENT HAS DETERMINED THAT THE MUSEUM HAD NO UNCERTAIN TAX POSITIONS THAT WOULD REQUIRE FINANCIAL STATEMENT RECOGNITION.</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>PART XII, LINE 2D - OTHER ADJUSTMENTS:</Identifier>
        <Explanation>COST OF GOODS SOLD - REPORTED ON PART VIII, LINE 10B: $46,757</Explanation>
      </Form990ScheduleDPartXIV>
      <Form990ScheduleDPartXIV>
        <Identifier>PART XIII, LINE 2D - OTHER ADJUSTMENTS:</Identifier>
        <Explanation>COST OF GOODS SOLD - REPORTED ON PART VIII, LINE 10B: $46,757</Explanation>
      </Form990ScheduleDPartXIV>
    </IRS990ScheduleD>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <GeneralExplanation>
        <ReturnReference>FORM 990, PAGE 1, PART I, LINE 6</ReturnReference>
        <Explanation>FOR THE FISCAL YEAR ENDED JUNE 30, 2011, MOMATH HAD TWO PRIMARY VOLUNTEER INVOLVEMENT OPPORTUNITIES: THE WORKING GROUP AND THE MATH MIDWAY EXHIBITION AT THE JUNE 2011 WORLD SCIENCE FESTIVAL IN MANHATTAN. FOR THE LATTER, VOLUNTEERS PROVIDED SUPERVISION AND GUIDANCE FOR VISITOR ACTIVITIES AT THE TRAVELING EXHIBITION WHEN IT APPEARED OUTDOORS AT THE STREET FAIR OF THE WORLD SCIENCE FESTIVAL. MOMATH STAFFED EACH OF 20 EXHIBITS WITH AT LEAST ONE VOLUNTEER AT A TIME, IN SOME CASES TWO VOLUNTEERS, AND HELD THREE SHIFTS OF VOLUNTEERS DURING THE DAY. THEREFORE, ONE CAN ESTIMATE THAT APPROXIMATELY 75 VOLUNTEERS ASSISTED MOMATH THAT DAY. THE WORKING GROUP CONSISTS OF VOLUNTEER ADVISORS WHO MEET MONTHLY TO SUGGEST ACTIVITIES AND PLANS FOR MOMATH AND WHO ALSO HELP FROM TIME TO TIME WITH STAFFING MEETINGS OR SMALLER PUBLIC EVENTS. THE MEETING SIZE RANGES FROM 15 TO 20 PEOPLE IN ATTENDANCE, AND THE EXACT LIST OF ATTENDEES VARIES. SOME WORKING GROUP VOLUNTEERS ALSO HELPED WITH THE MATH MIDWAY. THEREFORE, WE ESTIMATE THAT AN ADDITIONAL 15 VOLUNTEERS ASSISTED MOMATH THROUGH THE WORKING GROUP, BEYOND THOSE WHO HELPED AT THE WORLD SCIENCE FESTIVAL. THE BOARD OF TRUSTEES (14 INDIVIDUALS) SERVES ON A VOLUNTEER BASIS. FINALLY, THE MUSEUM HAS A ROBUST GROUP OF VOLUNTEERS WHO HELP IN THE OFFICE, SOME ON A REGULAR BASIS, ADDING ANOTHER 15 VOLUNTEERS, FOR A TOTAL OF ROUGHLY 120 VOLUNTEERS IN FISCAL 2011.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, SECTION A, LINE 4</Identifier>
        <Explanation>THE MUSEUM OF MATHEMATICS AMENDED ITS BYLAWS, SPECIFALLY THE TERMS OF THE BOARD MEMBERS NOW END IN DECEMBER.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, SECTION B, LINE 11</Identifier>
        <Explanation>THE MUSEUM OF MATHEMATICS HAS ITS FORM 990 PREPARED BY AN OUTSIDE ACCOUNTING FIRM AND HAS ESTABLISHED THE FOLLOWING REVIEW PROCESS TO ENSURE THAT THE INFORMATION REPORTED IS COMPLETE AND ACCURATE. WHEN THE FORM 990 HAS BEEN PREPARED, REVIEWED BY MANAGEMENT, AND IS READY TO BE FILED WITH THE INTERNAL REVENUE SERVICE, IT'S SUBMITTED ELECTRONICALLY TO MEMBERS OF THE ORGANIZATION'S GOVERNING BODY FOR ANY COMMENTS PRIOR TO ITS SUBMISSION. ANY COMMENTS ARE THEN GROUPED, SUMMARIZED, AND PROVIDED TO THE COMPLIANCE OFFICER OR COMMITTEE IN CHARGE OF FILING THE RETURN FOR THEIR REVIEW. EACH ISSUE IS DOCUMENTED AND ADDRESSED UNTIL THE RETURN IS FINALIZED AND APPROVED FOR FILING.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 12C</ReturnReference>
        <Explanation>THE MUSEUM OF MATHEMATICS CURRENTLY HAS IN PLACE A CONFLICT OF INTEREST POLICY THAT IT ANNUALLY MONITORS AND ENFORCES. THE BOARD CURRENTLY MANDATES THAT ALL MEMBERS OF MANAGEMENT AND THE GOVERNING BODY ANNUALLY SIGN A CONFLICT OF INTEREST POLICY AND DISCLOSE ANY POTENTIAL OR ACTUAL CONFLICTS THAT MAY EXIST. THE SIGNED CONFLICT OF INTEREST POLICY IS KEPT ON FILE AND BOARD MEMBERS MAY NOT VOTE ON AN ISSUE ON WHICH THEY HAVE A CONFLICT. THE MUSEUM OF MATHEMATICS ADOPTED A WRITTEN WHISTLEBLOWER POLICY ON MARCH 5, 2010. THE POLICY IS INCORPORATED IN THE EMPLOYEE HANDBOOK AND CREATES PROCEDURES FOR EMPLOYEES ACTING IN GOOD FAITH TO REPORT IN CONFIDENCE THE MISUSE OF A CHARITY'S ASSETS TO VARIOUS MANAGEMENT OFFICIALS. THE POLICY ASSIGNS A COMPLIANCE OFFICER AND CONTAINS PROCEDURES FOR REPORTING SUCH VIOLATIONS IN CONFIDENCE AND WITHOUT RETALIATION.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Explanation>FORM 990, PART VI, SECTION B, LINE 15: THE MUSEUM OF MATHEMATICS DOES NOT HAVE AN ESTABLISHED COMPENSATION REVIEW PROCESS FOR ITS EXECUTIVE DIRECTOR OR OTHER OFFICERS BECAUSE THEY DID NOT RECEIVE ANY COMPENSATION.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION C, LINE 18</ReturnReference>
        <Explanation>THE MUSEUM OF MATHEMATICS WILL MAKE ITS FORM 990 AVAILABLE FOR PUBLIC INSPECTION AS REQUIRED UNDER SECTION 6104 OF THE INTERNAL REVENUE CODE BY POSTING IT ON THEIR WEBSITE AS WELL AS GUIDESTAR.ORG AND OTHER SIMILAR TYPES OF WEBSITES. IN ADDITION, FORMS 990 AND 1023 ARE AVAILABLE UPON WRITTEN REQUEST AT 134 WEST 29TH STREET, SUITE 709/710 NEW YORK, NY 10001 OR BY CALLING THE ORGANIZATION DIRECTLY AT (212) 542 - 0566.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION C, LINE 19</ReturnReference>
        <Explanation>THE MUSEUM OF MATHEMATICS' GOVERNING DOCUMENTS, FINANCIAL STATEMENTS AND CONFLICT OF INTEREST POLICY ARE AVAILABLE UPON WRITTEN REQUEST AT 134 WEST 29TH STREET, SUITE 709/710 NEW YORK, NY 10001 OR BY CALLING THE ORGANIZATION DIRECTLY AT (212) 542-0566.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990,PART VII</ReturnReference>
        <Explanation>THE CHIEF OF OPERATIONS (COO) POSITION AT THE MUSEUM OF MATHEMATICS IS NOT PAID. THE COO IS ALSO AN EMPLOYEE OF AN UNRELATED TAXABLE ORGANIZATION. THE COO RECEIVED COMPENSATION FROM THE UNRELATED TAXABLE ORGANIZATION FOR A PORTION OF HER SERVICES TO THE MUSEUM OF MATHEMATICS (15 HOURS PER WEEK) THAT SHE WOULD HAVE RECEIVED REGARDLESS. THE UNRELATED TAXABLE ORGANIZATION DID NOT TREAT THE PAYMENTS AS A CHARITABLE CONTRIBUTION.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>CHANGES IN NET ASSETS OR FUND BALANCES:</Identifier>
        <ReturnReference>FORM 990, PART XI, LINE 5:</ReturnReference>
        <Explanation>NET UNREALIZED GAINS ON INVESTMENTS: 4,143.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>OVERSIGHT OF AUDIT AND SELECTION OF INDEPENDENT ACCOUNTANT</Identifier>
        <ReturnReference>990 PAGE 12, PART XI, LINE 2C</ReturnReference>
        <Explanation>THE MUSEUM'S BOARD OF TRUSTEES IS RESPONSIBLE FOR OVERSIGHT OF THE AUDIT OF ITS FINANCIAL STATEMENTS AND SELECTION OF AN INDEPENDENT ACCOUNTANT.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
  </ReturnData>
</Return>