Is your marriage as strong as Roman concrete?

<p>What makes Roman concrete so special, and why has it endured for 2000 years? And, why is it like a good marriage?</p> <p>This episode is also available as a blog post: <a href="http://the-end-time.org/2021/09/22/is-your-marriage-as-strong-as-roman-concrete/" target="_blank"><strong>http://the-end-time.org/2021/09/22/is-your-marriage-as-strong-as-roman-concrete/</strong></a></p>