Savannas are far more common that you may realize. For instance, did you know that they make up roughly half of the surface area in the tropics and sub-tropics? That they cover approximately 45% of South America and nearly 50% of Africa?
If you’re like me, you likely have only the bare minimum of an idea as to just what crystallography is. “Something to do with crystals” is just about the sum total of my own present understanding of it. However I also have gathered that it is the underlying field of study that has made an astonishing number of discoveries possible.