&gt; <i>RTFA</i><p>Please don&#x27;t be rude like that here. It breaks the HN guidelines:<p><a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;newsguidelines.html" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;newsguidelines.html</a><p>Your comment would be fine without that bit, and better still if it stated briefly what the detector does measure.