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        <NamePerson>CARTER GLASS</NamePerson>
        <BaseCompensationFilingOrg>136864</BaseCompensationFilingOrg>
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        <NamePerson>HASSAN VIRJI</NamePerson>
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        <NamePerson>AF SPILHAUS JR</NamePerson>
        <BaseCompensationFilingOrg>0</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
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      <Form990ScheduleJPartII>
        <NamePerson>JUDY HOLOVIAK</NamePerson>
        <BaseCompensationFilingOrg>0</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>0</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>0</BonusFilingOrg>
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      <Form990ScheduleJPartIII>
        <ReturnReference>PART I, LINE 1A</ReturnReference>
        <Explanation>AGU HAS PROVIDED BUSINESS OR FIRST CLASS TRAVEL (ON A CASE-BY-CASE BASIS) FOR THE AGU PRESIDENT WHEN MULTIPLE TRIPS (IN EXCESS OF 6 HOURS) TO ATTEND AGU BUSINESS MEETINGS ARE REQUIRED. ADDITIONALLY, THE CEO'S EMPLOYMENT AGREEMENT ALLOWS FOR BUSINESS OR FIRST CLASS TRAVEL FOR TRIPS IN EXCESS OF 5 HOURS. AGU DOES NOT INCLUDE THE COST OF FIRST CLASS TRAVEL IN TAXABLE INCOME.</Explanation>
      </Form990ScheduleJPartIII>
      <Form990ScheduleJPartIII>
        <ReturnReference>PART I, LINE 4A</ReturnReference>
        <Explanation>PART I, LINE 4A: THE FOLLOWING INDIVIDUALS RECEIVED SEVERANCE PAYMENTS: A.F. SPILHAUSE $614,471 JUDY HOLOVIAK $297,132 WILLIAM WHITE $12,452</Explanation>
      </Form990ScheduleJPartIII>
    </IRS990ScheduleJ>
    <IRS990ScheduleL documentId="RetDoc1042800001">
      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NameBusiness>
            <BusinessNameLine1>AMERICAN INSTITUTE OF PHYSICS</BusinessNameLine1>
          </NameBusiness>
        </NameOfInterestedPerson>
        <Relationship>SHARED BOARD MEMBERS</Relationship>
        <AmountOfTransaction>1348730</AmountOfTransaction>
        <DescriptionOfTransaction>PUBLICATION SERVICES</DescriptionOfTransaction>
        <SharingOfRevenues>0</SharingOfRevenues>
      </Form990ScheduleLPartIV>
    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <GeneralExplanation>
        <Identifier>CHANGES IN PROGRAM SERVICES</Identifier>
        <ReturnReference>FORM 990, PART III, LINE 3</ReturnReference>
        <Explanation>AGU CREATED A SEPARATE ENTITY PERFORM THE DUTIES RELATED TO SUPPORTING THE SECRETARIAT OF THE START PROGRAM. AGU WILL BE SHIFTING THE DUTIES OF THIS PROGRAM TO THE NEW ENTITY OVER FUTURE YEARS.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, SECTION A, LINE 3</Identifier>
        <Explanation>DURING 2010, AGU CONTRACTED A THIRD PARTY CONSULTING FIRM TO PROVIDE AN INTERIM EXECUTIVE DIRECTOR.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, SECTION A, LINE 4</Identifier>
        <Explanation>AGU AMENDED THEIR BYLAWS IN 2010 TO CREATE AND DEFINE THE DUTIES OF THE ORGANIZATION'S BOARD OF DIRECTORS.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, SECTION A, LINE 6</Identifier>
        <Explanation>AGU MEMBERSHIP ENCOMPASSES MORE THAN 58,000 INDIVIDUALS FROM OVER 135 COUNTRIES. THE GOAL OF AGU MEMBERSHIP IS TO UNITE EARTH, ATMOSPHERIC, OCEANIC, HYDROLOGIC, SPACE, AND PLANETARY SCIENTISTS BY PROVIDING A DYNAMIC FORUM FOR THE GEOPHYSICAL COMMUNITY THROUGH SCIENTIC JOURNALS, MEETINGS, ELECTRONIC MAIL, A WEEKLY NEWSPAPER, SCIENTIFIC AND TECHNICAL COMMITTEE ACTIVITIES, AND SEVERAL ONLINE DATA AND INFORMATION SERVICES. AGU IS AN INDIVIDUAL MEMBERSHIP SOCIETY OPEN TO THOSE PROFESSIONALLY ENGAGED IN OR ASSOCIATED WITH THE EARTH AND SPACE SCIENCES.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, SECTION A, LINE 7A</Identifier>
        <Explanation>ALL ELIGIBLE MEMBERS MAY VOTE TO ELECT THE UNION OFFICERS (PRESIDENT, INTERNATIONAL SECRETARY, AND GENERAL SECRETARY) AND CAN VOTE IN UP TO 3 SECTIONS OF THEIR CHOICE TO ELECT SECTION PRESIDENTS.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, SECTION B, LINE 11</Identifier>
        <Explanation>THE GOVERNING BODY IS GIVEN THE OPPORTUNITY TO REVIEW AND COMMENT ON AN ELECTRONIC COPY OF THE FORM 990 BEFORE FILING WITH THE INTERNAL REVENUE SERVICE.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 12C</ReturnReference>
        <Explanation>IF AN OFFICER, DIRECTOR, TRUSTEE, OR EMPLOYEE HAS ANY INDICATION THAT HE OR SHE HAS A DIRECT OR INDIRECT CONFLICT OF INTEREST, OR RECEIVES INFORMATION REGARDING A POTENTIAL CONFLICT OF INTEREST OF ANOTHER, THE CEO, COO, AND DIRECTOR OF HUMAN RESOURCES MUST BE IMMEDIATELY NOTIFIED. ALL AGU OFFICERS, DIRECTORS, TRUSTEES, COMMITTEE MEMBERS, AND EMPLOYEES ARE REQUIRED TO SIGN AN ANNUAL CONFLICT OF INTEREST STATEMENT.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION B, LINE 15</ReturnReference>
        <Explanation>AGU CONDUCTS A MARKET-BASED SURVEY USING WELL-KNOWN COMPENSATION SURVEYS BASED ON REVENUE, NUMBER OF EMPLOYEES, INDUSTRY, AND GEOGRAPHIC REGION. THE SALARY RANGES ARE FROM 80% - 120% OF THE 50TH PERCENTILE OF THE SURVEY DATA. SALARY INCREASES ARE TIED TO PERFORMANCE AND ARE STRICTLY MERIT BASED. THE SALARY INCREASE RANGES ARE SET ANNUALLY IN CONNECTION WITH OUR BUDGET CYCLE. COMPENSATION OF THE EXECUTIVE DIRECTOR WAS LAST REVIEWED IN JULY OF 2010.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>FORM 990, PART VI, SECTION C, LINE 19</ReturnReference>
        <Explanation>AGU'S GOVERNING DOCUMENTS AND CONFLICT OF INTEREST POLICY ARE AVAILABLE TO THE PUBLIC ONLINE AT WWW.AGU.ORG AND FINANCIAL STATEMENTS ARE AVAILABLE UPON REQUEST.</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: 4,720,000. PRIOR PERIOD ADJUSTMENTS: -1,090,963. START NET ASSETS 150,234. TOTAL TO FORM 990, PART XI, LINE 5: 3,779,271.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
  </ReturnData>
</Return>