Niels de Winter<p>This cool study shows the first-ever finding of a <a href="https://mastodon.social/tags/sponge" class="mention hashtag" rel="tag">#<span>sponge</span></a> building it's <a href="https://mastodon.social/tags/skeleton" class="mention hashtag" rel="tag">#<span>skeleton</span></a> out of fluorapatite, the same mineral we use to grow our <a href="https://mastodon.social/tags/teeth" class="mention hashtag" rel="tag">#<span>teeth</span></a>. It is also the oldest reef-building sponge found to date at 480 million years old!</p><p><a href="https://www.pnas.org/doi/10.1073/pnas.2426105122" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://www.</span><span class="ellipsis">pnas.org/doi/10.1073/pnas.2426</span><span class="invisible">105122</span></a></p>