Why are we living longer than our ancestors?

<p>Steven Johnson discusses the Extra Life project, which includes a book and new BBC Four series co-presented with David Olusoga. He chronicles a revolution in medicine, and explores the innovations in science and public health that have led to huge increases in life expectancy since 1900.</p> &#10;&nbsp;<br /><hr><p style='color: grey; font - size: 0.75em; '>See <a style='color: grey; ' target='_blank' rel='noopener noreferrer' href='https://acast.com/privacy'>acast.com/privacy</a> for privacy and opt-out information.</p>