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Unit 19: Biology Part 2 Page 114 of 137

food coloring to one of them. Number the cups 1-10. You can make the
colored cup whatever number you want.

1. Explain to your volunteers that we are going to imagine they work
together in an office, and have frequent appointments with each other.
Have everyone fill out a chart like the one below. To fill the chart out,
the volunteers need to make an “appointment” with each other at a
certain time. For example, if Jessica and Raul are two of your
volunteers, they might agree to have an “appointment” at 9:00.
Jessica would write “Raul” under 9:00, and Raul would write “Jessica”
under 9:00. You should not meet with the same person twice.

Time Appointment With
9:00
10:00

11:00

2. Assign everyone a number. The oldest volunteer is number 1, and the
youngest is number 10, with everyone else somewhere in between
based on their ages.
3. Give the volunteers their water cup, based on their number and tell
them to go to their 9:00 appointment.
4. During the appointment, we will imagine that each individual sneezed
once. We’ll model this by exchanging a little bit of water. In the
example above, for instance, Raul would spill some water into Jessica’s
cup, and Jessica would spill some into Raul’s.
5. Repeat the procedure for the 10:00 and 11:00 appointments.

6. Once the appointments are over, announce that anyone who has
colored water (even just a little coloring) is now sick. Ask who is sick
and record the number.

What’s Happening: At the start of the activity, only one person was sick (had
colored water.) Now, it is likely that most people are. Diseases spread
quickly, especially when people do not make good decisions about their
health and the health of others. The sick person should really have stayed
home from work. If he or she had, no one else would have become sick. If
they did come in, they should have at least made an effort to cover their
mouths when sneezing.

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