2
votes
1answer
87 views

Is there a way to know if a spring/water has sulfur?

Is there a quick way or a cheap test (like some kind of strip which would change its color if sulfur is present) to know if the water in a spring has sulfur content in it ? Specifically, I am ...
2
votes
1answer
242 views

Which (South) East-Asian contries are the cleanest? [closed]

I had been in Thailand recently and I was negatively surprised with how dirty the country is. Garbage was everywhere - along the roads, in the temples and museums, even in the sea. I expected the ...