 automatically take care of instantiating the right class, as well as
            caching instances of <span class="code">Manager</span>. An instance of
            <span class="code">DBBinder</span> is held by the engine as attribute
            <span class="code">db_binder</span>. Here's an example of making a
            simple query.
        </p>
        <table>
            <tr class="first_row">
                <td style='width:50%'>2.7</td>
                <td>3.0</td>
            </tr>
            <t