<lesson>
        <title>Hindsight is 20/20</title>
        <grade target="5" lowerbound="3" upperbound="6"/>
        <time total="50" unit="minutes"/>
        <lesson_cost amount="0" unit="USDollars"/>
        <summary>Students measure their eyesight and learn how lenses can enhance eyesight`
        </summary>
        <keywords>
            <keyword>eyesight</keyword>
            <keyword>vision</keyword>
            <keyword>20/20</keyword>
        </keywords>
        <edu_standards>
            <edu_standard identifier="14000"/>
            <edu_standard identifier="14011"/>
        </edu_standards>
        <lesson_body>With our eyes we see the world around us. Having two eyes helps us see a larger area than just one eye and with two eyes we can... etc. etc.
        </lesson_body>
        <copyright owner="We, the legal owners of this document" year="2016" />
    </lesson>