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In page Silly Putty:

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In addition to its success as a toy, other uses for the putty have been found. In the home, it can be used to remove substances such as dirt, lint, pet hair, or ink from various surfaces. The material's unique properties have found niche use in medical and scientific applications. Occupational therapists use it for rehabilitative therapy of hand injuries.[1] A number of other brands (such as Power Putty and TheraPutty) alter the material's properties, offering different levels of resistance. The material is also used as a tool to help reduce stress, and exists in various viscosities based on the user's preference.[citation needed]