Document:

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                                                                   EXHIBIT 10.65

                           PEABODY ENERGY CORPORATION

                                  AMENDMENT TO
                      NON-QUALIFIED STOCK OPTION AGREEMENT

      THIS AMENDMENT TO NON-QUALIFIED STOCK OPTION AGREEMENT (this "Amendment")
dated as of June 15, 2004, is made by and between Peabody Energy Corporation, a
Delaware corporation (the "Company") and the undersigned employee of the Company
or one of its subsidiaries or affiliates (the "Optionee").

      WHEREAS, the Company previously adopted the 1998 Stock Purchase and Option
Plan for Key Employees of P&L Coal Holdings Corporation (now known as Peabody
Energy Corporation) (the "Plan");

      WHEREAS, pursuant to the terms of the Plan, the Company and the Optionee
entered into that certain Non-Qualified Stock Option Agreement(s) dated as of
<<Date_1>>,<<Date_2>> <<Date_3>><<Date_4>><<Date_5>><<Date_6>>, (the
"Agreement") whereby the Company granted the Optionee the right to acquire
shares of the CompaNY'S common stock under the terms and conditions set forth in
the Agreement;

      WHEREAS, pursuant to Section 5.7 of the Agreement, the Company and the
Optionee may amend the Agreement by a writing executed by both parties thereto
which specifically states that it is amending the Agreement;

      WHEREAS, the Company deems it appropriate, and the Optionee agrees, to
modify the provisions of the Agreement relating to the vesting and the
exercisability of the Superperformance Option (as such term is defined in the
Agreement) in connection with certain specified corporate events;

      NOW, THEREFORE, the parties hereto agree as follows:

                                       I.

      Section 1.6 of the Agreement is amended by adding the following at the end
      thereof:

      "Notwithstanding the foregoing, on or after June 15, 2004, a Change of
      Control shall mean:

                  (a) any Person (other than a Person holding securities
      representing 10% or more of the combined voting power of the Company's
      outstanding securities as of May 22, 2001, the Company, any trustee or
      other fiduciary holding securities under an employee benefit plan of the
      Company, or any company owned, directly or indirectly, by the shareholders
      of the Company in substantially the same proportions as their ownership of
      stock of the Company), becomes the beneficial owner, directly or
      indirectly, of securities of the Company,

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      representing 50% or more of the combined voting power of the Company's
      then-outstanding securities; or

                  (b) during any period of twenty-four consecutive months (not
      including any period prior to May 22, 2001), individuals, who at the
      beginning of such period constitute the Board (the "Incumbent Board"),
      cease for any reason to constitute at least a majority of the Board;
      provided, however, that the Incumbent Board shall be deemed to include any
      new director, whose election by the Board or nomination for election by
      the Company's shareholders was approved by a vote of at least
      three-fourths (3/4) of the directors then still in office who either were
      directors at the beginning of the period or whose election or nomination
      for election was previously so approved; provided further that the
      Incumbent Board shall be deemed to exclude (A) any director nominated by a
      Person who has entered into an agreement with the Company to effect a
      transaction described in Section 1.6(a), (c) or (d) and (B) any director
      nominated by any Person (including the Company) who publicly announces an
      intention to take or to consider taking actions (including, but not
      limited to, an actual or threatened proxy contest) which if consummated
      would constitute a Change in Control); or

                  (c) the consummation of any merger, consolidation, plan of
      arrangement, reorganization or similar transaction or series of
      transactions in which the Company is involved; provided, however, that a
      Change of Control shall not include any transaction or series of
      transactions as a result of which the shareholders of the Company
      immediately prior thereto continue to own, in substantially the same
      proportions as their ownership immediately prior to such transaction(s),
      more than 50% of the combined voting power of the securities of the
      Company or such surviving entity (or the parent, if any) outstanding
      immediately after such transaction(s) (either by remaining outstanding or
      by being converted into voting securities of the surviving entity); or

                  (d) the shareholders of the Company approve a plan of complete
      liquidation of the Company or the sale or disposition by the Company of
      all or substantially all of the Company's assets, other than a liquidation
      of the Company into a wholly owned subsidiary.

      As used in herein, "Person" (including a "group"), has the meaning as such
      term is used for purposes of Section 13(d) or 14(d) of the Securities
      Exchange Act of 1934, as amended (or any successor section thereto)."

                                       II.

      Section 3.4 of the Agreement is amended by adding the following at the end
      thereof:

            "(d) The Superperformance Option I and the Superperformance Option
      II shall vest and become non-forfeitable (but only to the extent such
      Superperformance Option I and Superperformance Option II have not
      otherwise terminated or become exercisable) upon a Change of Control
      occurring at any time on or after June 15, 2004. Notwithstanding the
      accelerated vesting described

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      in the immediately preceding sentence, any Superperformance Option I or
      Superperformance Option II subject to such accelerated vesting shall only
      become exercisable upon the earlier of (i) 9 1/2 years from the date of
      grant, and (ii) a Termination of Employment without Cause or for Good
      Reason or by reason of death, Disability or Retirement."

                                      III.

      Except as provided herein, the Agreement shall remain in full force and
      effect.

      IN WITNESS WHEREOF, this Amendment has been executed and delivered by the
parties hereto.

                                           PEABODY ENERGY CORPORATION

                                           /s/ Sharon Fiehler

                                           EVP Human Resources & Administration

                                           Optionee:

                                           ____________________________________
                                           <<First_Name>> <<Last_Name>><PAGE>

                                                                    EXHIBIT 10.1

                               TRANSFER AGREEMENT

      THIS AGREEMENT, made as of the 16 day of June, 2004, between RENAISSANCE
LEARNING, INC., a Wisconsin Corporation (the "Company") and TERRANCE D. PAUL, an
individual resident of the State of Colorado ("Paul").

                                 R E C I T A L S

      Paul is a Co-Founder, Co-Chairman and Director of the Company and has from
time to time served in various other executive capacities as an employee of the
Company. For several years, Paul has been writing a book on information theory
which is currently an untitled, incomplete work in progress (the "Book"). In the
course of working on the Book, Paul also conceived of an idea for a speech
monitoring system to enhance language development in young children, the concept
of which is described in a confidential disclosure memorandum dated May 11,
2004, prepared by Paul and provided to the Audit Committee of the Board of
Directors of the Company (the "Idea"). Since initial work on the Book was
commenced as a Company project and certain Company resources were used by Paul
to assist in writing the Book, future disputes could arise between the Company
and Paul with respect to ownership or other rights in the Book and/or the Idea.
The Company does not wish to devote further resources to completion of the Book
or commercialization of the Idea. Paul has advised the Company that he has an
interest in completing the Book and potentially commercializing the Idea and, in
order to avoid any future disputes with respect to ownership, has requested the
Company to assign to him such rights, if any, as it may have in the Book and the
Idea. The Company has agreed to such assignment in consideration of certain
payments from Paul and Paul's agreement to grant to the Company certain first
negotiation and first refusal rights with respect to the Idea as set forth
herein.

      NOW, THEREFORE, in consideration of the mutual promises and agreements
hereinafter set forth and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties agree as follows:

                                    ARTICLE 1

                              Assignment of Rights

      The Company hereby sells, assigns, and transfers to Paul, all of its
right, title and interest in and to the Book and the Idea, including, without
limitation, all rights to obtain and maintain any copyright and patent rights in
the Book and Idea and all rights to license, sublicense or grant other rights
and interests in or with respect to, and to otherwise commercialize, the Book
and the Idea.

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                                    ARTICLE 2

                                     Payment

      In consideration of the assignment set forth in Article 1 above, Paul
agrees to pay to the Company the sum of Sixty Seven Thousand Five Hundred Fifty
Dollars ($67,550). Such payment shall be made within five (5) business days
after execution of this Agreement, in accordance with such instructions as shall
be provided to Paul by the Chief Financial Officer of the Company.

                                    ARTICLE 3

                           Company Warranty Disclaimer

      Paul acknowledges that the Company disclaims and makes no representations
or warranties whatsoever with respect to the Book or the Idea and that, without
limitation, the Company makes no representation or warranty (i) that it has
title to or ownership of any rights in the Book or the Idea; (ii) as to the
copyrightability or patentability of the Book or the Idea or that any copyright
or patent rights have been or may be filed, prosecuted, or maintained with
respect thereto; (iii) that the Book and/or the Idea will not infringe any
patent, copyright or other intellectual property rights of third parties; or
(iv) as to the commercial potential or utility of the Book and/or the Idea.

                                    ARTICLE 4

            First Negotiation and Refusal Rights Relating to the Idea

..
      4.1. Transfer Restrictions. The parties acknowledge that Paul may (but
shall not be obligated to) from time to time engage in research and development
activities with respect to the Idea and/or may apply for patents and prosecute
patent applications with respect to the Idea, or applications, derivatives or
improvements thereof. Paul agrees that he will not, at any time during the ten
(10) year period commencing on the date of this Agreement (the "Restricted
Period"), sell, license, transfer, or otherwise grant any rights with respect to
(collectively, "Transfer") (i) the Idea, or any application, technology or
improvement relating to, derived from, or based upon the Idea (an "Idea
Application") or (ii) any patent, patent application or other intellectual
property right in whole or in part claiming, relating to, derived from or based
upon, the Idea or any Idea Application (an "Idea Right") for use in the Company
Field (as hereafter defined) unless, prior to any such Transfer, he complies
with the provisions of Sections 4.2 and 4.3 below relating to the Company's
first negotiation and first refusal rights. As used in this Agreement, the
"Company Field" shall mean products and/or services used for educational,
administrative, testing or assessment purposes by schools or school districts
having students enrolled in one or more of grades K through 12 or the equivalent
thereof, or by students, teachers, administrators or other employees of such
schools or school districts.

      4.2. First Negotiation Rights. In the event, at any time during the
Restricted Period, Paul should develop an Idea Application which may reasonably
be anticipated to be useful in the Company Field or if Paul should at any time
propose to license or otherwise Transfer any Idea Rights for use in the Company
Field, Paul shall give a written notice to the Company (an "Availability
Notice") briefly describing the Idea Application and/or the Idea Rights which
Paul proposes to license or otherwise transfer. After giving the Availability
Notice, Paul shall provide such additional information concerning such Idea
Application or Idea Rights as the Company may reasonably request. If, within
sixty (60) days after its receipt of the Availability Notice, the Company gives
a written notice (an "Interest Notice") to Paul that it is interested in
acquiring the Idea Application and/or the Idea Rights specified in the
Availability Notice for use in the Company Field, the Company and Paul shall
enter into good faith negotiations with respect thereto and Paul will not enter
into any agreement or arrangement with any third party with respect to the use
of such Idea Application or Idea Rights in the Company Field unless the Company
and Paul fail to execute a letter of intent or binding agreement relating to
such use within ninety (90) days after Paul's receipt of the Company's Interest
Notice. If the parties do not execute a letter of intent or agreement within
such ninety (90) day period, Paul shall be free to offer the Idea Application
and/or the Idea Rights identified in the Availability Notice to third parties;
provided, however, that prior to entering into any agreement or other
arrangement with respect to any such Idea Application and/or the Idea Rights
with any third party, Paul shall comply with the provisions of Section 4.3 below
relating to the Company's first refusal rights.

      4.3. First Refusal Rights. In the event, at any time during the Restricted
Period, Paul proposes to sell, license, or otherwise Transfer any Idea
Application and/or Idea Rights for use in the Company Field (any such Idea
Applications and/or Idea Rights being hereinafter called the "Offered Rights")
to any person other than the Company, Paul shall first give a written notice to
the Company (a "License Offer") specifying the Offered Rights which are proposed
to be Transferred, the person to whom such rights are to be Transferred ( the
"Proposed Licensee"), the nature of the proposed

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transaction, the form and amount of consideration to be received by Paul (the
"Transaction Payments"), the terms of payment and the other material terms of
the proposed transaction and offering the Offered Rights to the Company upon the
same terms as offered to the Proposed Licensee; provided however, that if the
Offered Rights are offered to the Proposed Licensee on a non-exclusive basis,
such rights shall nevertheless be offered to the Company for use in the Company
Field on an exclusive basis on the same terms as the Offered Rights are offered
to the Proposed License on a non-exclusive basis. After making the License
Offer, Paul shall provide such additional information concerning the Offered
Rights and the proposed transaction as the Company may reasonably request. The
Company shall have the right, exercisable by written notice (an "Acceptance
Notice") given to Paul within sixty (60) days after delivery of the License
Offer (the "Option Period") to elect to enter into an exclusive license or
otherwise exclusively acquire the Offered Rights in the Company Field on the
same terms as offered to the Proposed Licensee; provided, however, that if the
Transaction Payments are payable in securities of the Proposed Licensee or any
other consideration than money, the Company shall have the right to acquire such
Offered Rights for an amount equal to the value of the consideration offered by
the Proposed Licensee as agreed by the parties, or, if the parties are unable to
agree, as determined by an investment banking firm or other appraiser mutually
agreed upon by the parties or, if the parties are unable to agree, by an
appraiser appointed by the firm then serving as the Company's independent
auditor upon request of either party. If the Company elects to license or
otherwise acquire the Offered Rights specified in the License Offer, Paul and
the Company shall negotiate in good faith to agree upon a definitive license or
other agreement with respect to such Offered Rights on the terms specified in
the License Offer (except that the Company's rights shall be exclusive even
though non-exclusive rights may be offered to the Proposed Licensee) and, if the
parties so agree, Paul shall thereafter license or otherwise Transfer the
Offered Rights to the Company in accordance with the terms of such agreement. If
the Company does not elect to license or otherwise acquire the Offered Rights by
giving an Acceptance Notice prior to the expiration of the Option Period, or if,
within ninety (90) days after the Company gives an Acceptance Notice, the
parties are unable to agree, after good faith negotiations, upon the terms of a
definitive license or other agreement with respect to such Offered Rights, then
Paul shall have the right to license or otherwise Transfer the Offered Rights
described in the License Offer to the Proposed Licensee for use in the Company
Field, provided that such Transfer is made for consideration not less than the
Transaction Payments and upon substantially the same terms as specified in the
License Offer, but if such Offered Rights are not licensed or otherwise
Transferred to the Proposed Licensee upon such terms within six (6) months after
the Company receives the License Offer, such Offered Rights shall again be
subject to, and shall be licensed or otherwise Transferred only in accordance
with, this Section 4.3.

      4.4. Limitations. The first negotiation and first refusal rights granted
to the Company pursuant to Sections 4.2 and 4.3 shall extend only to Idea
Applications and Idea Rights for use in the Company Field and nothing herein
shall be construed to restrict Paul from licensing or otherwise Transferring any
Idea Application or Idea Right to any person at any time for use outside of the
Company Field, provided that the agreement with such person shall expressly
restrict any such use within the Company Field.

      4.5. Expiration. The Company's rights and Paul's obligations under this
Article 4 shall expire upon the expiration of the Restricted Period.

                                    ARTICLE 5

                                  Miscellaneous

      5.1. Binding Effect. This Agreement shall be binding upon and shall inure
to the benefit of the parties hereto and their respective heirs, successors and
assigns. Paul shall not at any time, whether during his lifetime or upon his
death, sell, assign, or otherwise Transfer, all or any portion of his interest
in any Idea Application or Idea Right unless the transferee executes a written
agreement, in form and substance reasonably acceptable to the Company, to be
bound by the provisions of Article 4 hereof, as fully and to the same extent as
Paul is bound thereby.

      5.2. Governing Law. This Agreement shall be governed and construed in
accordance with the laws of the State of Wisconsin without regard to the
principles of conflict or choice of law thereof.

      5.3. Arbitration. All disputes and differences of any kind arising under
this Agreement, including any dispute as to the arbitrability of any particular
issue, which cannot be settled amicably by the parties, shall be finally settled
in an arbitration to be conducted under the rules of the American Arbitration
Association (the "AAA") by a single arbitrator selected under the rules of the
AAA. Unless the parties agree otherwise, any such arbitration shall be held in
Dane County, Wisconsin. The decision of any such arbitrator shall be final and
binding upon the parties and may be enforced in any court of competent
jurisdiction and no party shall seek redress against any other in any court or
tribunal except solely for the purpose of obtaining execution of any arbitral
award or of obtaining or enforcing a judgment

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consistent therewith. The fees and expenses of any arbitration conducted
pursuant to this Section 5.3 shall be shared equally by the parties.

      5.4. Notices. All notices and other communications under this Agreement
shall be in writing and shall be deemed given or delivered when (i) delivered by
hand, (ii) received at the addressee's address, if sent by Certified Mail Return
receipt Requested or by express mail, Federal Express or other express delivery
service, or (iii) sent by facsimile transmission (receipt confirmed) to the
addressee at the following address (or to such other address as a party may
specify by notice hereunder):

      If to the Company:             Renaissance Learning, Inc.
                                     2911 Peach Street
                                     Wisconsin Rapids, WI  54495
                                      Attention:  Chief Financial Officer

                                    Fax: 715-424-3414

      If to Paul:                   Terrance D. Paul
                                    Paul Family Office
                                    2060 Broadway, Suite 200
                                    Boulder, CO 80302

                                    Fax: 303-413-0165

      5.5. Counterparts. This Agreement may be executed in counterparts, each of
which shall be considered an original but all of which together shall constitute
the same instrument.

      5.6. Severability. Any term or provision of this Agreement which is
invalid or unenforceable in any jurisdiction shall, as to that jurisdiction, be
ineffective to the extent of such invalidity or unenforceability without
rendering invalid or unenforceable the remaining terms and provisions of this
Agreement or affecting the validity or enforceability of any terms or provision
of this Agreement in any other jurisdiction. If any provision of this Agreement
is so broad as to be unenforceable, such provision shall be interpreted to be
only as broad as is enforceable.

      5.7. Further Actions. Each party agrees to execute, acknowledge and
deliver such further instruments and to take such other actions as may be
necessary or appropriate, or as the other party may reasonably request, in order
to carry out the purpose and intent of this Agreement. Without limitation, the
Company agrees to execute from time to time such assignments and other
instruments or documents as Paul may reasonably request in order to confirm and
perfect his interest in the Book and the Idea and to apply for and prosecute any
copyright or patent rights with respect thereto.

      5.8. Integration. This Agreement embodies the entire agreement and
understanding between the parties relating to the subject matter hereof and
supercedes all prior agreements and understandings relating to such subject
matter. There are no representations, warranties, covenants, promises or
agreements by any party relating to the subject matter hereof which are not
expressly set forth herein.

      5.9. Captions. The headings and captions to the Articles and Sections of
this Agreement are for reference only and shall not be used in construing the
provisions hereof or otherwise affect the meaning hereof.

      5.10. Amendments. This Agreement may not be amended except by written
instrument signed by each of the parties. No waiver by a party of any failure by
the other party to perform any obligation hereunder shall operate as a waiver or
estoppel with respect to any other subsequent failure.

      IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date first above written.

                                        RENAISSANCE LEARNING, INC.

                                        By: /s/ John Hickey
                                            ---------------------------------
                                            John Hickey, President and CEO

                                        /s/ Terrance D. Paul
                                        -------------------------------------
                                        Terrance D. Paul

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