Liam O'Mara IV, PhD<p>On <a href="https://mastodon.social/tags/ThisDayInHistory" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ThisDayInHistory</span></a> in 1831, British <a href="https://mastodon.social/tags/naturalist" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>naturalist</span></a> <a href="https://mastodon.social/tags/CharlesDarwin" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>CharlesDarwin</span></a> set saiil on <a href="https://mastodon.social/tags/HMSBeagle" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>HMSBeagle</span></a>. His five years on the ship, the influence of <a href="https://mastodon.social/tags/CharlesLyell" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>CharlesLyell</span></a>'s geology, and careful observations of nature led him to a mechanism for <a href="https://mastodon.social/tags/evolution" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>evolution</span></a>: <a href="https://mastodon.social/tags/NaturalSelection" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>NaturalSelection</span></a>, a central fact of biology.</p>