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A drop of rain hurdles toward a farm and finds itself in a nasty situation — soil mixed with fertilizer and cow poop. After soaking up nutrients, the droplet seeps below the surface into a nearby stream. An excess of nutrients like nitrogen and phosphorus can cause toxic algae growth where nothing but plant matter can survive.
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Trainees headed for service in the US Peace Corps train in their country of service. It's been that way for years. For two years in the late 1960s,…