Roland Dieterich<p>Probably also interesting for geocachers: engineerguy Bill Hammack explains the engineering of plastic soda bottles.</p><p><a href="https://mstdn.social/tags/geocaching" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>geocaching</span></a> <a href="https://mstdn.social/tags/preform" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>preform</span></a> <a href="https://mstdn.social/tags/engineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>engineering</span></a></p><p><a href="https://www.youtube.com/watch?v=kU_gH36GG58" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">youtube.com/watch?v=kU_gH36GG5</span><span class="invisible">8</span></a></p>