Shape Memory Alloy - An alloy (mix of metals) that can be shaped when cold but returns to its original shape when heated., Photochromic - Changes colour in response to light., Thermochromic - A material that can change colour with change in temperature., Hydrochromic - A material that produces a colour change when exposed to water., Hydrogel - A material that can absorb up to 1000 times its volume, Shape memory polymer - A plastic that can be shaped when hot and will stay in that shape when cooled.,

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