I kind of expected the article to at least mention the end Ordovician Extinction by gamma ray burst theory:<p><a href="http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;0809.0899" rel="nofollow">http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;0809.0899</a>
<a href="http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;astro-ph&#x2F;0309415" rel="nofollow">http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;astro-ph&#x2F;0309415</a>
<a href="http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;1409.7049" rel="nofollow">http:&#x2F;&#x2F;arxiv.org&#x2F;abs&#x2F;1409.7049</a>