glow

And in the news today, a menagerie of genetically modified animals. There is something for everyone here... http://www.dailymail.co.uk/pages/live/articles/news/news.html?in_article_id=414142&in_page_id=1770 "[A] giant cow, three times the size of ordinary cattle, reared without fat to produce...

What causes the violet light you get when you open a self adhesive envelope in the dark? Noticed this today when I opened an envelope in the gloomy front hall. It only works on some, so it must be a propety of a particular kind of adhesive I assume.

Not really sure what forum this belongs in, but: Of course, we can expect protests. Pretty cool though! I guess you'd save money on your tank lighting, if nothing else. What I want, though, is a glow in the dark cat. I keep tripping over mine when I get up in the night. ;)