Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
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The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
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Galalith is a type of plastic that can be made from milk. It is odourless, insoluble in water, biodegradable, anti-allergenic, antistatic, and virtually non-flammable.
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