A little future science in the news.
Bismuth is a heavy, brittle metal that forms colorful geometric crystals when melted and then slowly cooled…Bismuth has unique electronic properties that not only make it a good candidate for solar cells, but make it great for indoor use — a place where traditional photovoltaics don’t perform too well. That means it might one day replace the need for batteries in billions of indoor electronics, like home sensors and health monitors, says Hoye.
For more, check out this Verge/MSN story.