Consider the graph of activity versus time for a naturally occurring isotope. 
The half-life of this isotope is between 80 and 120 hours.
Definitions:
Contract
A legally enforceable agreement between two or more parties where specific promises are made for a consideration.
Martin and Nevin
A hypothetical name, possibly referring to a partnership, company, or legal case, without a specific definition absent context.
Conditional Contract
An agreement that becomes enforceable only under specified conditions.
Assignment
The transfer of rights, duties, or property from one party to another, often used in the context of contracts or real property.
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