anchor.diff:      <tr>
         <th>#</th>
         <th>Building Type</th>
  +      <th>Interaction</th>
       </tr>
     </thead>
     <tbody>
  
positive.code:   <tr>
      <td>Total population:</td>
      <td><%= @tribe.population.total %></td>
    </tr>
    <tr>
      <td>Population density:</td>
      <td><%= @tribe.population.density %>/mi<sup>2</sup></td>
    </tr>
    <tr>
      <td>Warriors:</td>
      <td><%= @tribe.warriors %></td>
      <% if @tribe.has_building?("barracks") %>
        <td>
          <form action="/tribes/<%= @tribe.slug %>/warriors" method="post">
            <input type="hidden" name="_method" value="patch">
            <input type="number" name="amount">
            <input type="submit" value="Enlist warriors">
            <em>($<%= @warrior_price %>/warrior)</em>
          </form>
        </td>
      <% end %>
    </tr>
    <tr>
      <td>Farmers:</td>
  
negative.code:   <tr>
      <td>Technology:</td>
      <td><%= @tribe.technology %></td>
      <td></td>
    </tr>
  </table>
  
  