Inspiring projects: Tears caused by onions, depending on the type and the colour of someone’s eyes


Nora, Maite, Lander and Julen.


Biology, Chemistry.


1st and 2nd year secondary school.


Does the colour of someone’s eyes influence the tears caused when cutting an onion? Do all types of onions have the same effect? This is precisely what we will analyse in this research project.

Teacher’s notes:

This research project is conceptually easy to understand, with simple control and subordinate variables. However, designing the research project may be more complex. How do we rigorously measure the time? How many people will we need for each eye colour? What other variable will be controlled in the sample? Gender, age, use of glasses, etc.

Read here the complete ebook ‚ÄúSTEAM project ideas to inspire young people‚Ä̬†

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