Physio therapy putty – it’s like silly putty for adults, a non-newtonian fluid. You can roll it into a ball and work it with your hands to strengthen the muscles in them, the harder you squeeze it the harder it gets. It makes me laugh because a while ago someone at work had some, and one evening when I was working late I was playing with it, I got distracted and ended up leaving the ball of putty on the top of my colleague’s computer mouse. The next morning he came in to find his mouse completely engulfed in bright green goo! After I left, it had relaxed back into a liquid and oozed all over his mouse; it looked hilarious!
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