When I began reading this chapter I realized how much harder it is to follow than the last two chapters. I had to read this chapter in a period of two days and go slower than just read it all at once. I find it interesting how Shubin explains how "we start as a single cell that contains all the DNA needed to build our body"(46). I love how Shubin takes a complex subject of having a pinky side and a thumb side and explain it all so well and in simple terms. The experiments Shubin describes sound very interesting and I would love to do similar experiments in the future. I became really sucked into the concept of the Sonic hedgehog and how it works with our bodies. As Shubin explained "If Sonic hedgehog hadn't turned on properly during the eighth week of your own development, then you either would have extra fingers or your pinky and thumb would look alike" (53). Especially after reading this specific chapter I feel if an other scientist other than Shubin wrote this novel then I would have never been interested in bones and limbs in the way I am now.
~Caroline Eskander
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