The four greatest innovations in the history of mankind are:

FIRE — used to provide heat, to provide light, and to cook food

THE WHEEL — used to transport people and goods more efficiently

THE INTERNET — used to bring the world’s body of knowledge to every person

BLOCKCHAIN — a worldwide “read-only” spreadsheet using triple-entry accounting, which has never been hacked and will damage the banking business, the insurance business, and a great many lawyers.

Now, what do you think?  Talk among yourselves . . .