Allow me to introduce you to the scientific method.

Observation: The buttons are different sizes. Hypothesis: The size of the buttons could indicate the amount of flushing that occurs when the buttons are pushed. Experiment: video record the amount of flow resulting from the pushing of the one of the buttons. Wait 60 seconds. Record the amount to flow resulting from the pushing of the other button. Wait 60 seconds. Record the amount of flow resulting from the pushing of both buttons simultaneously. Then compare videos. Conclusion: __________________