Summary: This week, we investigate the HIV preventative measure PrEP, which could be turning the tide on new infection rates - but is it safe to buy online? Plus, the toughest ever spider's web, a journey back through the history of language and the plant that could help clean up our oceans. For information regarding your data privacy, visit <a href="https://www.acast.com/privacy">acast.com/privacy</a>
