Wonder of the Week: Why do we yawn?

I think we yawn because you might be sleepy. - Danielle
I think we yawn because it’s a warning that we might be tired. - Leah
I think we yawn because we might be tired from all of that playing. - Madison
I think we yawn because sometimes we are a little bit tired. - Norman
I think we yawn because we get tired. - Charlie

Is yawning contagious?

I think yawning is contagious because you can yawn and then someone else might yawn. - Charlie
I think yawning is not contagious because sometimes you just yawn. - Norman.