When the tree falls it causes pressure waves through the air. This happens whether someone is there to hear it or not. If there is someone to hear it, those pressure waves trigger neural activity in the brain of the listener and the listener experiences a sound. The tree falling is the trigger, the experience of sound occurs within the brain/mind of the listener.
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The answer taught in classrooms is: the sky is blue because blue is a short wavelength and air molecules scatter short The Master I Am Now Ornament, Personalized Masters Graduation Gift, Yoda Graduation Ornament, Masters Degree MBA Gift Masters Grad of light better than long wavelengths. Violet has a shorter wavelength than blue, but our eyes aren’t very sensitive to violet light. Blue light is less polarized than the other colors because it scatters more times and multiple scatterings destroy polarization.
To get this out of the way first, I should note that there are two types of intelligent people – people I like to call “cognitively intelligent” The Master I Am Now Ornament, Personalized Masters Graduation Gift, Yoda Graduation Ornament, Masters Degree MBA Gift Masters Grad and also people I like to refer to as “The Master I Am Now Ornament, Personalized Masters Graduation Gift, Yoda Graduation Ornament, Masters Degree MBA Gift Masters Grad“. The former has to train their mind to grasp certain aspects of life by way of concentrated calculation. Eventually, this concentration becomes less of a strain for the person, but still exerts some form of effort. These are the people who are always getting 99’s in exams, and cramming for days prior.