Fuzzy Logic Science Show

If you were to visit a river, it might look beautiful, but is it healthy? Looks may be a good start, but properly assessing a water body takes a bit more and, yes, how it smells is another indicator. And then, why should we care whether a river or stream is in good condition? Leon Metzling was a Victorian EPA senior water ecologist for 30 years. Here he's talking to Rod.