<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>balls187</author><text>Most of my office windows at Boeing had little ultrasonic buzzers on them to prevent such an attack.&lt;p&gt;On my offices was actually in a large farad cage to reduce&amp;#x2F;eliminate EMF leaks from workstations.</text><parent_chain><item><author>ravenstine</author><text>One way you can do this without another light source is to bounce a laser beam off a window or other things that are reflective.&lt;p&gt;In fact, the same principle can be achieved with radio.  The Russians once planted a device in a wooden seal they gave to a US ambassador as a gift which, when a focused radio beam was aimed at it, would reflect and oscillate that beam due to vibrations in the air.&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;The_Thing_%28listening_device%29&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;The_Thing_%28listening_device%...&lt;/a&gt;</text></item></parent_chain></comment><story><title>Spies can eavesdrop by watching a light bulb&apos;s vibrations</title><url>https://www.wired.com/story/lamphone-light-bulb-vibration-spying/</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>acidburnNSA</author><text>Back in the 90&amp;#x27;s I found an old cardboard box full of radioshack electronics components and a paper schematic of how to put it together. I asked my dad what it was. He had been into an electronics hobby in the 1980s and told me that it was a amplifier to receiving laser light bounced off of a window for spy stuff. I couldn&amp;#x27;t believe it. The kit became my first significant soldering project. I got it all together and put my beloved laser pointer on a tripod and tried bouncing it in. I never did get it to the point that I could hear voices but boy could I ever hear cool vibration noises when I tapped the window.&lt;p&gt;It was extremely fun and I&amp;#x27;ve been soldering things here and there ever since.</text><parent_chain><item><author>ravenstine</author><text>One way you can do this without another light source is to bounce a laser beam off a window or other things that are reflective.&lt;p&gt;In fact, the same principle can be achieved with radio.  The Russians once planted a device in a wooden seal they gave to a US ambassador as a gift which, when a focused radio beam was aimed at it, would reflect and oscillate that beam due to vibrations in the air.&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;The_Thing_%28listening_device%29&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;en.wikipedia.org&amp;#x2F;wiki&amp;#x2F;The_Thing_%28listening_device%...&lt;/a&gt;</text></item></parent_chain></comment><story><title>Spies can eavesdrop by watching a light bulb&apos;s vibrations</title><url>https://www.wired.com/story/lamphone-light-bulb-vibration-spying/</url></story>