runs the first time, the returned results are stored in memory for the next time you try to require it.
We can prove this by adding a print statement to <strong>world.lua</strong>:</p>
<pre><code class="lang-lua"><span class="hljs-comment">-- world.lua</span>

<span class="hljs-built_in">print</span>(<span class="hljs-string">&quot;This is the world&quot;</span>)

<span class="hljs-keyword">local</span> world = love.physics.newWorld(<span class="hljs-number">0</span>, <span class="hljs-number">9.81</span> *