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'The two groups can't agree on the best route to the cheese, so Dr. Lazarus will introduce another variable to break the impasse.'
How scientists propose
The Tomb of the Unknown Quantity.
'The basic laws of supply and demand can be affected by the input of this variable.'
'Guilty or not guilty? - That doesn't leave me much wiggle room.'
'Can you use this dolly to show us what was done to you by the variable exponent?'