Thank God there is still hope for my vocabulary....
Hardness is a measure of how resistant solid matter is to various kinds of permanent shape change when a compressive force is applied. Some materials (e.g. metals) are harder than others (e.g. plastics). Macroscopic hardness is generally characterized by strong intermolecular bonds, but the behavior of solid materials under force is complex; therefore, there are different measurements of hardness: scratch hardness, indentation hardness, and rebound hardness.
Recent: The peak age for beauty, wealth, and more - Business Insider
The peak age for beauty, wealth, and more - Business Insider
The age you peak at everything.........
The chart is wrong.
Where does mastering charts fall on this? Hopefully after understanding people's emotion or else I am in trouble!