An Introduction to Polkadot <iframe src="https://docs.google.com/presentation/d/e/2PACX-1vRDi-jF8JsbKfgDBJ5NmShe_H-3wF4rb-oSozgGJfpoKO5ZQzbmEECTzVlP9ZBluqkpjFR3hf-tDdNR/embed?start=false&loop=false" frameborder="0" width="1440" height="839" allowfullscreen="true" mozallowfullscreen="true" webkitallowfullscreen="true"></iframe>