&gt; pls don&#x27;t ask me about space elevators  until someone at least builds a carbon nanotube structure longer than a footbridge<p><a href="https:&#x2F;&#x2F;twitter.com&#x2F;elonmusk&#x2F;status&#x2F;559557786514632704" rel="nofollow">https:&#x2F;&#x2F;twitter.com&#x2F;elonmusk&#x2F;status&#x2F;559557786514632704</a>