Mysteries in physics – Everything You Wanted To Know About…Physics, episode five

<p>Prof Jim Al-Khalili reveals some of the biggest unsolved mysteries. We talk about the plausibility of time travel, whether there are multiple universes and what we need to discover a ‘theory of everything’.</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>