Microscope
At the same time, some discoveries were made in our micro-universe, were they found that exist not only out there in the space but also in ourselves. We are talking about the microspcope that was one of the best invetions that helped us to develope this task.
With this instrument, we, were able to discover important cells that without it, we would never discover it. Humans didn´t had a clue that this "cells" even existed. This helped also for discovering bacterias and made a push to new medicinal instruments that changed radically the society.
3 The Eye Something you didn´t know