Where does electricity come from? That's what listener Ati wants to know. Lindsay and Marshall get on the case of a massive blackout that plunged 50 million people into darkness Scientist and engineer Mike Legatt helps us solve the mystery.

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If you have any questions about science that you'd like Lindsay and Marshall to help answer, go to our website - www.sciencepodcastforkids.com - and use the contact form. While you're there, you can also find a blog with lots of great resources about this episode.