I Had Never Heard Of Radioactive Glass Before,

then in two days I read two articles about it, 

the first was about canary glass, uranium glass, or Vaseline glass, as it became known in the early 20th century for its similar colour to petroleum jelly, it emits radiation, but the amounts are tiny, infinitesimal, ridiculously small, I did not realise it but the manufacture and hobby of collecting this type of glass is huge, the point about this type of glass is that when you expose it to black light it's true colour is illuminated,

 then the next day I read about artist Victor Engbers who built a greenhouse for the Amsterdam Light Festival out of uranium glass,

how strange, one day never heard of uranium glass, next day two articles about it, in case you are interested in the light festival it is open until January 22nd. but as always double check before travelling.