Saying that ice is slippery is like saying that water is wet -- it's something we've known for as long as we can be said to have known anything. Presumably, humans as a species knew ice was slippery ...
If a room is depressurized will a visible cloud or mist form? I would expect it would, but when I apply a vacuum to a flask I see no cloud form inside the flask. Would a room behave differently than ...