雨つぶで発電するアイデア。[An idea to generate electricity in a raindrop]

Making every shower an electric storm by Jean-Jacques Chaillout of the atomic energy commission in Grenoble.

ピエゾ素子を活用する様です。熱帯地域が増加する傾向にあるので有効かも。
It seem to utilize piezoelectric element. Because a tropical area tends to increase, are you effective?
via:treehugger