Ask HN: What happened to 'effusive' in 1866?
If you do a Google search for &#x27;effusive&#x27;, and then click on &#x27;Translations, word origin, and more definitions&#x27; you see the start of a hockey stick graph while &#x27;effusive&#x27; gets users.<p>https:&#x2F;&#x2F;www.google.com&#x2F;?gws_rd=ssl#q=effusive<p>What happened in 1866 that made this word popular?  And why did growth hit a plateau around 1900?<p>Is there something we could learn about virality just by studying word popularity?