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Doubles as a wallet ruler
8) QR code which links to rotating monthly Easter-eggs on a hidden GLG page
The iconic periodic table poster by author Theodore Gray is now available as an 8
The Super Safe Green Laser Pointer is the ultimate in laser safety at <1 mW (Class 2) low power levels emitting 532 nm light
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Silicone Lens Mold for Gelatin Lenses (DIY) stem education Doubles as a wallet rulerSilicone mold for making your own concave lens, convex lens and spherical lens out of Gelatin (or Agar) for light and optics experiments and science lessons. This durable silicone tray makes a perfect set of lenses with simple, plain gelatin concave, convex and semi spherical. Perform dozens of science experiments including refraction, magnification, measure the index of refraction of the gelatin you can even add sugar or coloring to explore even more
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