How did the richest people on the planet make their fortunes?
I'm Simon.
Jack.
And I'm Zing Singh.
Join us for Good Bad Billionaire.
Each episode we pick a billionaire and we find out how they made their money.
Like the comedian Jerry Seinfeld, the financier George Soros, the golf star Tiger Woods.
Then Simon and I have a decision to make.
Do we think they are good, bad or just another billionaire?
Good, bad, billionaire.
Listen on BBC Sounds.
Hello, I'm Claudia Hammond.
Welcome to the Evidence from the BBC where we take a topic and delve into the research to learn what we can all do to live a healthy life.
Now, this series is produced in collaboration with Wellcome Collection and we are back in their beautiful reading room in London with a live audience.
It is wonderful to be back here.
And today we are looking at salt.
It's a cheap foodstuff that most of us eat every day.
But once upon a time, salt was one of the world's most valuable commodities and with good reason.
It is crucial to our health.
It can preserve food and also, of course, it tastes good.