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Not all poisonous gases have a smell or a color. But a tiny grid of pastel- and candy-colored squares that effectively “sniffs” out hazardous chemicals in the air such as chlorosarin — a highly toxic ...

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Learn how to make color changing slime! Our guide shows you how to create mesmerizing, thermochromic slime for hours of sensory play. Regular slime is fun. But slime that changes color in your hands?