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SPOOKY SCIENCE LAB
The shop is shut, the lights are off, and something in the 200-in-1 is still running.
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CHAPTER 1 OF 7 · CURRENT
Two Lamps Taking Turns
Something is out past the window and there are two of it, and it blinks. Not together — one, then the other. Build a pair of lamps that take turns without anybody telling them to.
Level 1 · № 3 · Two-transistor flasher
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