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The leaking hourglass

I started thinking about our survival needs, from what came the important question: why are we not more careful on what we do on the planet, when it is what offer us the possibility to live?

Our survival needs are:
– nutriment
– oxygen
– water
– appropriate atmospheric pressure

We can survive:
– 3 min without air
– 3 hours without a regulated body temperature
– 3 days without water
– 3 weeks without food

The one I am the most interested in is the water. Maybe because it is my favourite element to be in and my favourite drink 🙂
Our body is composed between 60% and 80% of water. It (water) provides the environment necessary for life.

A sandglass is meant to give the time like it is indefinite, but what if it was leaking ?

I am thinking to make one with water. The amount of water inside would be equivalent on the volume available on earth/per person, and would leak in accordance of the diminishing of the resource.

 
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