This is something that has baffled me for years. Walk into any building (obtain permission first) and go to the kitchen, chances are you will see a container for coffee, teabags, possibly a box of green tea for that hippy girl in HR.|
You are also very likely to see a small pot or bowl of sugar, left there completely uncovered with its arse in the air for the world to see.
Why do people do this? I've never see someone have a coffee jar they leave permanently uncovered, r tea, or paprika, or salt, or pepper, or cumin...literally no other substance in the kitchen is so universally left to fend for itself.
Conversely, there is no other substance more likely to attract all kinds of insects (both crawling and flying) or congeal at the slightest suggestion of moisture. The thing most likely to be damaged by being uncovered is exactly that.
Stop doing it people.
My own slice of the internet is here: http://www.maulsquad.com - it isn't very good.