<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>spodek</author><text>If you haven&amp;#x27;t read &lt;i&gt;Sustainable Energy Without the Hot Air&lt;/i&gt;, by David Mackay, I recommend it.&lt;p&gt;Free download: &lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;withouthotair.com&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;withouthotair.com&lt;/a&gt;&lt;p&gt;About the author:&lt;p&gt;David MacKay FRS is the Regius Professor of Engineering at the University of Cambridge. He studied Natural Sciences at Cambridge and then obtained his PhD in Computation and Neural Systems at the California Institute of Technology. He returned to Cambridge as a Royal Society research fellow at Darwin College. He is internationally known for his research in machine learning, information theory, and communication systems, including the invention of Dasher, a software interface that enables efficient communication in any language with any muscle. He was appointed a Lecturer in the Department of Physics at Cambridge in 1995 and was a Professor in the Department of Physics from 2003 to 2013. Since 2005, he has devoted much of his time to public teaching about energy. He is a Fellow of the Royal Society.&lt;p&gt;Nine months after the publication of &amp;#x27;Sustainable Energy - without the hot air&amp;#x27;, David MacKay was appointed Chief Scientific Advisor to the Department of Energy and Climate Change.&lt;p&gt;TED talk: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.youtube.com&amp;#x2F;watch?v=E0W1ZZYIV8o&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.youtube.com&amp;#x2F;watch?v=E0W1ZZYIV8o&lt;/a&gt;&lt;p&gt;Harvard talk: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.youtube.com&amp;#x2F;watch?v=GFosQtEqzSE&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.youtube.com&amp;#x2F;watch?v=GFosQtEqzSE&lt;/a&gt;</text><parent_chain></parent_chain></comment><story><title>Eigg – A small Scottish isle that runs on 90-95% renewable energy</title><url>http://www.bbc.com/future/story/20170329-the-extraordinary-electricity-of-the-scottish-island-of-eigg</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>arethuza</author><text>Geology trivia: An Sgùrr, the shapely wee hill that features in the pics, is interesting as it started off as a valley that was filled with lava and ended up lasting longer than the surrounding rocks&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;An_Sg%C3%B9rr_(Eigg)&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;An_Sg%C3%B9rr_(Eigg)&lt;/a&gt;</text><parent_chain></parent_chain></comment><story><title>Eigg – A small Scottish isle that runs on 90-95% renewable energy</title><url>http://www.bbc.com/future/story/20170329-the-extraordinary-electricity-of-the-scottish-island-of-eigg</url></story>