Are you tempted? Multimillionaire Bryan Johnson believes he has found a way to defeat ageing and live forever.
The man who wants you to live for ever
Elixir of youth: Bryan Johnson, 46 (front) with son Talmage, 17, behind. Glossary
Iodine - A mineral found in some foods.
Manganese - A hard, brittle metallic element. We need it in our bodies in small amounts.
Experts - Someone who knows a lot about a particular subject.
Lentils - A very small dried bean which can be cooked and eaten.
AI - A computer programme that has been designed to think.