<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>kazinator</author><text>The form of the metal matters. The elemental lead in leaded solder is not nearly as harmful as the lead in various compounds like tetraethyl lead anti-knock additive for gasoline, or the compounds used in leaded paint.&lt;p&gt;About mercury, consider that it&amp;#x27;s still widely used in dental amalgam.&lt;p&gt;FDA article on amalgam: &lt;a href=&quot;http://www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/DentalProducts/DentalAmalgam/ucm171094.htm&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.fda.gov&amp;#x2F;MedicalDevices&amp;#x2F;ProductsandMedicalProcedur...&lt;/a&gt;&lt;p&gt;&amp;gt; &lt;i&gt;A lot more brave than I am, even if it is lead free.&lt;/i&gt;&lt;p&gt;Nobody who knows what they are doing works with lead-free solder for manual rework or repair. It needs a higher temperature, flows poorly, and produces an ugly matte surface, upon cooling, that looks like a cold solder joint even when the joint is actually good.&lt;p&gt;I can almost guarantee you that Woz is using nothing but 60&amp;#x2F;40 Sn&amp;#x2F;Pb in that shot. :)</text><parent_chain><item><author>dade_</author><text>It sure looks like Woz is holding solder with his mouth in the video.  A lot more brave than I am, even if it is lead free.  Maybe it is a generational thing, but my parents and adults around me when growing up were always warning me about the dangers of lead and mercury and would tell stories about how they played with them as children with no idea of the hazard.</text></item></parent_chain></comment><story><title>Steve Wozniak remembers the early days [video]</title><url>http://www.bloomberg.com/video/steve-wozniak-on-steve-jobs-geekiness-and-starting-apple-GVS_jUoTQtGYj9fwLg8dbQ.html</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>vinbreau</author><text>It made me uncomfortable as well. I actually knew a girl who willfully ingested a troublesome amount of mercury in high school. Her children have visible birth defects now.</text><parent_chain><item><author>dade_</author><text>It sure looks like Woz is holding solder with his mouth in the video.  A lot more brave than I am, even if it is lead free.  Maybe it is a generational thing, but my parents and adults around me when growing up were always warning me about the dangers of lead and mercury and would tell stories about how they played with them as children with no idea of the hazard.</text></item></parent_chain></comment><story><title>Steve Wozniak remembers the early days [video]</title><url>http://www.bloomberg.com/video/steve-wozniak-on-steve-jobs-geekiness-and-starting-apple-GVS_jUoTQtGYj9fwLg8dbQ.html</url></story>