History has taught us that humans are the most curious and smartest living organisms on the planet and as a result of this we invent new things. From the moment some caveman bashed a rock on the ground to make the first sharp-edged tool, to the development of electricity and the Internet, several key advancements stand out as particularly revolutionary. Despite the fact we have hardly spent fifteen years in the new millennium, our century is already full of great and not-so-great inventions which remind us that no matter how advanced our society might be, human curiosity never fails to seek out new advancements and technologies. See how these 25 spectacular inventions of the 21st century is helping to re-define humanity.