Are you tempted? Multimillionaire Bryan Johnson believes he has found a way to defeat ageing and help humanity survive in a world ruled by artificial intelligence.
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.
Utah - A mountainous state in the west of the USA. More than half its inhabitants are Mormons, who founded its capital, Salt Lake City.
Mormon - Members of the Church of Jesus Christ of Latter-Day Saints. Mormonism was founded in the US by Joseph Smith, who Mormons believe to be a prophet.
Missionary - A person who travels to spread a religion.
Ecuador - A country in South America.
Depression - Low mood that affects someone's daily life, and can last for weeks or months.
AI - A computer programme that has been designed to think.