Gamma-Ray Bursts Could Wipe Out All Life, but Are Unlikely to Hit Earth

In <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=Jj3LZGleMBQ" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=Jj3LZGleMBQ</a> there are some talks about stars like <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;WR_104" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;WR_104</a> .

Title says &quot;wipe out all life on Earth.&quot; Subtitle says &quot;sterilize all life on Earth.&quot; But paragraph 8 says &quot;sterilize half of all life on Earth.&quot;<p>I clicked because I wanted to know how it was possible to sterilize all life bar none.