These other submissions were more lucky.<p>* <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10308708" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10308708</a> (7 points, 8 days ago, 6 comments )<p>* <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10323565" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10323565</a> (2 points, 5 days ago, 7 comments) (more interesting comments)<p>Very short version of the comments: They claim that they can harvest ~30µW, this is very little. For example, it can only blink a led a few times per minute, because a normal led use 30mW=30000µW. Read the complete comments for more details.