Comparing the lives of the people before and now will make anyone realize the changes that happened in society not just in terms of culture, language, or rights but more importantly, changes in people's way of life due to the existence of science and technology
Using fire to cook, through chipping one flint over the other to produce a spark, all the while without realizing the laws of friction and heat
Tools from stone and flints marked the era of the Stone Age, during the advent of our own Homo sapiens, and humans began to sharpen stones as one would a knife; an example of this is the simple machine called wedge