There is a diagram about the improvements on the sharp tools in the Stone Age.
We observe the Tool A which was making in the 1.4 milion ago tools looking more sharper than the Tool B which was making in the 0.8 milion year ago.
When we look at he front view Tool B has a more boldy structure than the Tool A. And also we can observe the in Tool A it has some edges and curves more than the other tool. Moreover, Tool B is much wider than the Tool A. When we look at the Side view firstly we can see the Tool A is thicker than the Tool B. It is almost 3 or 4 times thicker than the Tool B.
Lastly, when we observe the back view we can see most of the information similar to the front view. Tool B has wider structure and Tool A has more sharp like triangle structure.
