The art of grave digging.

The older corpse more commonly have gold and other relics. Some places stopped leaving gold inside of the coffins.  There are people who willpay more then $500 for the skull of someone famous. They can even be gold plated to increase the value. For example, ronald reagons skull is apart of a meme about turning his head into a bong. If collected, It could probably sell for allot.

Just remember famous or historical figures skulls sell to all kinds of people. Of course it has to be cleaned and polished.

Human bones of historical figures could be the next form of currency, there one of a kind, have to be mined, then historical significance.

Imagine being owning Albert Einsteins skull, it might be just sitting in a cemetery somewhere. If someone could own this for $200 who wouldn't buy this? as long as its clean and coated.

>>3
Albert Einsteins skull

It's ash.

>>4 he didn't want anyone to know they preserved his brain. He must have used it as and example.