A concept developed by two students at Harvard University, also known as "Applications in Squirrel Performance Evaluation" or something like that.

The objective is to lure an urban squirrel towards the user via a nut with a string tied around it. After the squirrel grabs the nut, it will then attempt to run away (and be unable to) because the nut is on a string. The skill now comes into play. From this point, failure conditions are as follows: Success results when the user is able to increase tension and maintain squirrel hold. User then must lift squirrel off the ground while squirrel clings to nut, still determined to have his treat.

Pictures and further documentation can be found at:

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