as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
construct a hypothesis to explain why people yawn.
user
my hypothesis is that people yawn in order to regulate brain temperature and increase alertness. yawning helps to draw cool air into the lungs, which cools the blood and reduces the temperature of the brain. it also increases the amount of oxygen available to the brain, which facilitates alertness.
assistant