(FULL) How do Spies Encipher Messages? All About Spies In History

<p>In this episode, we travel through 2,500 years of spies and secret codes — from a message hidden under a messenger&#39;s hair to the machines that helped win a world war — and then you get to crack a secret code yourself.</p><p>Newsletter: <a href="news.kidslearninglab.com" target="_blank" rel="noopener noreferer">news.kidslearninglab.com</a></p><p>iPhone App: <a href="kidslearninglab.com/app" target="_blank" rel="noopener noreferer">kidslearninglab.com/app</a></p>