Ok, so the title is pretty self explanatory, but I'm curious to hear people's opinions on this.
To me, the greatest invention we have come up with is written word. The fact that we are able to translate ideas and thoughts onto paper and even immortalise it, is absolutely incredible. Furthermore, the power that written word has is also awe inspiring; such a medium can bring down governments, and equally raise new ones up. They encapsulate our laws and customs, and pretty much everything we can imagine.
On the other hand, the worst invention, in my opinion, humanity has come up with, is nuclear weaponry. We have actually created something that could very well wipe us out, or end civilisation at the very least. I see no positives to something that can indiscriminately wipe out 100s of thousands of people in the blink of an eye.
Feel free to disagree with me, and I am curious to hear your opinions on whatever you perceive to be the best and worst creations of our species.