Aerogel—the world's lowest density solid made of 96% air. Nearly impossible to feel when holding it.

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GEEKY GIFT #2: ($80) ECOSPHERE: Inside these sealed glass balls live shrimp, algae, and bacteria, all swimming around in filtered seawater. Put it somewhere with some light, and this little ecosystem will chug along happily for years, no feeding or cleaning necessary, totally oblivious to the fact that the rest of the world exists outside.

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