(You can do this with your
friends or family--or even by yourself.)
Did you know that there are millions of microbes on your hands? Most are harmless, but some may be disease-causing germs. Washing your hands is one of the best ways to prevent the spread of infections.
When was the last time you
washed your hands? Was it a quick splash under cold water? Did you
use soap? What have you done since you washed? Have you eaten, put
your fingers in your mouth, or touched someone else? Do you think your
hands were clean?
Try this experiment and you'll
discover the most effective way to remove bacteria from your hands.
2. Then wash your hands, but try different methods. (If you're doing this with friends, each of you can try a different way and you can compare your success with each other.)
Each time rub your hands briskly
for 20 seconds and record the results. Look for the amount of cinnamon
(pretend bacteria) that remains after each method.
Did you get them clean without
soap? Did warm water help? When you wash your hands in real life, soap
lifts off millions of microbes and rinses them away.
Does it matter how much time
you spend washing them?
3. Try it again. This time
use warm water and soap, but change the length of time:
4. What did you learn?
Epidemic! | Kids' Habitat |