Mercury would be a health and safety nightmare. The vapour is toxic thats before some numpty starts playing with it.
What links these capital cities ?
Copenhagen
Kabul
Bogota
Ankara
Mexico City
Can I call foul?
I remember watching something on the clean up of the Ankara river a few years ago. They said it was so badly polluted they couldn't call it a river any more.
Having googled, I was correct.
Kabul certainly has a river. We've seen enough news reports of the Taliban dumping bodies in it during the war there.
too many karaoke nights tells me its a 1965 either that or they were singing the wrong lyrics badly.
Are we talking major wars or local disputes?