The egg lab concluded with students receiving the following instructions:
- Gently rinse and dry egg
- Measure and record the final mass
- Discard the egg and cup
- Calculate the change in mass of the egg
To calculate the change in mass, students were instructed to subtract the initial mass (measured yesterday) from the final mass (measured today). A positive change means the egg gained mass. A negative change means the egg lost mass. Students reported out their data (shown below), and then we discussed the movement of water across the membrane of eggs placed in various solutions (final picture below).
The Art of Science 
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