What's the craziest realization you've ever had?

Micky Dolenz wrote: »

you make your own luck and your own way.

Cienciano wrote: »

Grand philosophy until you get cancer

shuffles88 wrote: »

All water was someone else's urine at one time or another, you could say all water is weecycled

Humans have been around for a few hundred thousand years, and the total number of humans who have ever lived is usually estimated to be around 110 billion. The question of how much water we should drink per day is the subject of furious debate—the "8 glasses" thing seems to be a myth—but the amount of water we actually drink per day seems to be about a liter. This amount varies a little depending on climate, but if we assume the average historical human drank a liter of water per day for 40 years, then our species has drunk about 100 trillion liters of water in total.

100 trillion liters (100 km3) is still very little compared to even the volume of all rivers (1,200 km3). This means that, since our drinking water passes through the water cycle and is quickly diluted by rivers and oceans, the majority of the water molecules we drink have never been drunk by any other human.

BenThere wrote: »

^^^
That assumes we are all drinking water direct from a river or equivalent source whereas in reality, in most cities, we are drinking water, pissing it out, recycling it in reservoirs etc and starting the processes all over again and not only that but we are repeating the process throughout our entire lives!!