We have a quiz for you of the everyday-person ilk:

How much water should we, also of that ilk, drink every day?

But you win the giant stuffed panda bear if you look as if you don't have a clue. Because, well, neither do scientists. Not even after all the ongoing yip-yap touting water.

As the-man-with-our-favorite-name, Amby Burfoot, tells us in his runnersworld.com blog, scientists have long tried to prove the need for the magical eight-ball number eight glasses of water. But to no avail.

We do know we can't live for more than a few days without water. And that people with certain diseases need more water. And now, thanks to Amby (do you mind if we call you Amby?) and Scientific American, we now know these five other things:

1 Sunny + hot = need for more water. Indoors + watching Jell-O congeal = no such need.

2 Athletes = need for more water. What is sweat, after all? A salty version of, yes – water. Replenish that which soaks your shirt.

3 My yellow Americans. Without being too obvious, check the color of your tinkle. It needs to be pale yellow. If it's dark, it's too concentrated and must be diluted. How? One guess.

4 Ix-nay on rapid weight loss. You may be dehydrated if you lose too many pounds too quickly.

5 Drink when you're thirsty. Wow. What a concept.