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Challenge: Design a more powerful battery

Video transcript
- [Voiceover] My penny battery is powerful enough to light a red LED, but I have a blue LED here. And when I attach it, it doesn't light up. Can you design a penny battery that's powerful enough to light a blue LED? Here's a hint. Blue light is a higher frequency than red light and so requires more energy. In the next video, I'll show you the solution I came up with.