So is that what you meant by rubber legs? The activity has pairs subject a chicken bone to vinegar and observe what happens over a period of days. Individuals then write up a lab report and document their observations and findings. 

Concepts

bones, minerals, osteoporosis, the skeletal system, vinegar, calcium, the human body, biomedical engineering, technology resources

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Instructional Ideas

• Research the types of materials vinegar will disolve

Classroom Considerations

• The lab requires observations over a period of several days
• Pupils should have general knowledge about the functions of the skeletal system
• The fourth segment in a five-part unit

Pros

• Includes a rubric to grade the lab report
• The worksheet details the important aspects to include in the report

Cons

• The activity does not connect the idea that the vinegar dissolves minerals in the bone