Just like humans, water resides in different places and spends time traveling to get from place to place. Also like humans, that time varies from drop to drop (or person to person). So then the questions are, how long does water reside in one place and how much time does it take to travel from one place to another?
Thankfully, we human are beginning to search for answers to these questions, according to the article entitled “How long does a water molecule stay in a river? The speed at which it leaves is critical to conservation efforts” by John Donovan over at Mother Nature Network.
Then maybe one day I can answer the burning question, how long it take a toy boat to travel from Lake Itaska down the Mighty Mississippi River down to the Gulf of Mexico? Believe me, the kids and I have tried but will little success.