I just realized that if we lost all of our technology we would have to start over by lighting a fire first.
Tech trees are something I think about a lot.
>Pick up a piece of moulded plastic tat
>Wonder about how many tools were used to create the tools needed to produce it
>The tools that were required to produce those tools
>How many regressions are there until I get to bare hands?
On an off-topic note:
Joule, second, metre and kilogram are to units as energy, time, distance and mass are to ____?