It seems that our brain possesses the philosopher's stone that enables us to turn lead into gold and helps us bounce back to normal levels of well-being.
The bad news is that, in our opinion, we will never find the philosopher's stone.
In particular they sought a fanciful substance called "the elixir of life", a powerful medicine which was to cure all illness, and which some people thought would turn out to be the same substance as "the philosopher's stone".
The mythical philosopher's stone, or sorcerer's stone, is said to be a chemical substance capable of turning lead into gold.
To change a base metal into gold required the proportions to be changed by the action of a mysterious substance which came to be called "the philosopher's stone".