Cochlea a protein motor called prestin on their outer membranes; it generates additional movement that couples back to the fluid–membrane wave. This "active amplifier" is essential in the ear's ability to amplify weak sounds. The active amplifier also leads to the phenomenon of soundwave vibrations being emitted from the cochlea back into the ear canal through the middle ear (otoacoustic emissions). Otoacoustic emissions are due to a wave exiting the cochlea via the oval window, and propagating back through the middle ear to the eardrum, and out the ear canal, where it can be picked up by a microphone. Otoacoustic emissions
Where the Sidewalk Ends (poem) the children because they know the place where the sidewalk ends. Looking more in depth at this poem makes clear what Shel Silverstein is saying. Do what the children do. They know the place where the sidewalk ends. And in doing so, you will find the joy and passion for life that they have. When he says to follow the markings of the children and you will find the place where the sidewalk ends, it is not a literal command to physically follow them. Rather he is saying put on the mindset of a child and you will, in turn,