Is Smiling Contagious? *
Areas of Science |
Human Behavior |
Difficulty | |
Time Required | Average (6-10 days) |
Prerequisites | None |
Material Availability | Readily available |
Cost | Very Low (under $20) |
Safety | Adult supervision is recommended when collecting your data. |
*Note:
For this science project you will need to develop your own experimental procedure. Use the information in the summary tab as a starting place. If you would like to discuss your ideas or need help troubleshooting, use the Ask An Expert forum. Our Experts won't do the work for you, but they will make suggestions and offer guidance if you come to them with specific questions.
If you want a Project Idea with full instructions, please pick one without an asterisk (*) at the end of the title.
If you want a Project Idea with full instructions, please pick one without an asterisk (*) at the end of the title.
Abstract
You've probably observed from your own personal experiences that some actions are contagious. Yawning is a great example. When one person in a room yawns, several other people usually do, too. Coughing, clearing your throat, these are other actions that often seem contagious. But what about smiling? Have you ever walked down the street and had a random stranger smile at you? Did it make you happy? Did you smile back? In this science fair project, you'll investigate whether smiling is contagious. You'll need to think of a way to design your experiment. One option would be to take a walk around a park and keep track of how many people smile at you, and whether those numbers change based on whether you smile at them or not. Or maybe you want to see if smiling has a chain reaction by having a friend walk a little ways behind you and see if the number of smiles he or she receives changes depending on whether you smile at the passersby first. However you design your experiment, make sure you're observing many people so that you can draw accurate conclusions. The Science Buddies guide Sample Size: How Many Survey Participants Do I Need? will help you determine how many observations you need to make. So put on a smile, because science is fun!Share your story with Science Buddies!

Cite This Page
General citation information is provided here. Be sure to check the formatting, including capitalization, for the method you are using and update your citation, as needed.MLA Style
Science Buddies Staff.
"Is Smiling Contagious?" Science Buddies,
28 July 2017,
https://www.sciencebuddies.org/science-fair-projects/project-ideas/HumBeh_p042/human-behavior/is-smiling-contagious.
Accessed 12 Dec. 2019.
APA Style
Science Buddies Staff.
(2017, July 28).
Is Smiling Contagious?
Retrieved from
https://www.sciencebuddies.org/science-fair-projects/project-ideas/HumBeh_p042/human-behavior/is-smiling-contagious
Last edit date: 2017-07-28
Experimental Procedure
For this science project you will need to develop your own experimental procedure. Use the information in the summary tab as a starting place. If you would like to discuss your ideas or need help troubleshooting, use the Ask An Expert forum. Our Experts won't do the work for you, but they will make suggestions and offer guidance if you come to them with specific questions.If you want a Project Idea with full instructions, please pick one without an asterisk (*) at the end of the title.
Share your story with Science Buddies!

Ask an Expert
The Ask an Expert Forum is intended to be a place where students can go to find answers to science questions that they have been unable to find using other resources. If you have specific questions about your science fair project or science fair, our team of volunteer scientists can help. Our Experts won't do the work for you, but they will make suggestions, offer guidance, and help you troubleshoot.Ask an Expert
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