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Have a Happy Thought:      One huge benefit of living in modern cities is the infrastructure, often unseen or ignored by many, that keeps our cities clean , and us healthy. Even if we do know about things like sewers and stormwater pipes, (Yes, I know that many of my readers are VERY aware of this critical infrastructure – but today’s post might still be news even for you!) we don’t often know the history of why we have what we have, today.     For example, I recently learned how bird poo led to combined s ewer systems . (Combined sewers are very common in the modern western world, although many are being replaced now with separated stormwater and sewage/wastewater systems. They’ve probably been in your local news in the last year.)     A VERY simplified agriculture and history lesson first: plants need food to grow – we usually call this “fertilizer”. A very good source of fertilizer, if properly used, is human waste – often throughout history this wa...