aeroplane (not just because I can fly one)# and... the knife and fork wicked peaces of equipment can stab people and kill with them, cut things, eat things bang them on the table to make a tune etc wicked invention
Electricity Fire Calligraphy with out any of those we woould have nothing, no communication, no mobility, no nothing Yes i know we didnt not create Electricity or Fire, but once we learned how to create it, and obtain it, we've used it to do everything.
WE now do know how to make it... called generators? we may have not created it created it... but we still can create it... we just know how to obtain it better now...