Blueprinting, which has been around since 1842, is a common way to reproduce an architectural drawing. Tune in to learn more about the complex chemical processes that make blueprints blue -- and white -- in this podcast from HowStuffWorks.com. Learn more about your ad-choices at <a href="https://www.iheartpodcastnetwork.com">https://www.iheartpodcastnetwork.com</a>See <a href="https://omnystudio.com/listener">omnystudio.com/listener</a> for privacy information.

What is a tank engine?

Whether the topic is popcorn or particle physics, you can count on BrainStuff to explore -- and explain -- the everyday science in the world around us.