What innovation has most transformed the world? In what words, what innovation has most greatly helped and reshaped humanity through its journey of evolution.

I would argue that the very ability to tame fire, is one of humanity's greatest accomplishments. With fire came warmth, and light. With fire we could cook meat, launching our species into a growth of an exponential rate. And with its brightness, we could migrate and travel. Spreading our species into the very corners of our earth. The moment our ancestors harnessed the sparks of fire, we were set apart from any other living creature on Earth. Suddenly our species had the ability to adapt, change, advance, and innovate like no other living soul to touch our planet. And it all started with fire. Fire affected the entire course of human history. It ignited our world.