<img class="aligncenter size-full wp-image-13673" src="https://www.dz-res.com/wp-content/uploads/2017/11/tear.jpg" alt="" width="1000" height="764" /> دموع البشر تحتوي على بلورات بإمكانها توليد الكهرباء. <strong>المصدر: <a href="https://www.ul.ie/news-centre/news/irish-scientists-discover-method-to-produce-electricity-from-tears/">هنا</a> <a href="http://aip.scitation.org/doi/10.1063/1.4997446">هنا</a></strong>