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Unit 19: Biology Part 2 Page 113 of 137

What’s Happening: The Centers for Disease Control (CDC) recommends
washing your hands with warm, soapy water for 10-15 seconds. This
assumes that you scrub vigorously, and that your hands are not abnormally
dirty.

Experiment: Don’t Forget the Soap

Materials:

 Vegetable oil
 Water

 Soap

1. Put a spoonful of vegetable oil on your hands

2. Try to wash it off in only cold water, without soap.
3. Repeat with only warm water and with water and soap.

What’s Happening: Plain water, especially plain cold water, is not as

effective at getting the oil off your hands as warm water and soap.
This model used vegetable oil, but we have natural oils that build up in
our skin. To clean them, and to get rid of pathogens, soap is needed!

Experiment: Don’t Sneeze On Me!

Materials:

 10 volunteers
 10 cups
 Water

 Food coloring

When we sneeze, we release a huge number of pathogens into the air. If we

don’t cover our mouth, these pathogens are more likely to infect another
person, making them sick. The person we infected can now spread the
disease to others. In this way, pathogens can spread very quickly. You’ll
need about 10 volunteers for this activity. (You can be one of the 10.) Prior
to the activity, prepare 10 cups, by filling them up with water and adding

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