It’s certainly true. If you
convert a sandwich into fuel by consuming it, it will certainly change the
outside world in some form or other; either by expanding your stomach which takes
up more space, or expelling it out of your arse in a different form. Here, a
different mass occurs, and you may hear a mighty splash and a smell of methane
might also be released, depending upon the health of your digestive system. There
may be sound effects too if you’re that unfortunate. Or if you take space
travel, then the earth has had to evolve over thousands of years for us to
manufacture the materials required to change the environment outside of it. But
a more modern phrase to that of our Greek philosopher friend would be that you
get out what you put in. Even if it does take a long time to shift last week’s
curry out of you.
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