I got one of these $25 kits in a physics class that gives you the eyeball versio... | Hacker News

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mindviews on June 30, 2020 | parent | context | favorite | on: Declining eyesight improved by looking at deep red...

I got one of these $25 kits in a physics class that gives you the eyeball version of the fancy digital spectrometer: https://shop.sciencefirst.com/starlab/kits/5800-cardboard-sp...

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