Scientists and mathematicians struggle to find an explanation to the commonly seen proportion known as the "golden ratio". It has been seen a lot through out history, from ancient architecture like the Parthenon made by the greeks, to the measurements in pinecones or sea shells.
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The melanin in Chloe's hair is decreasing. Melanin is a substance in our hair, skin, and eyes that determines pigment. If Chloe has more melanin in her hair, her hair will be darker; if Chloe has less melanin in her hair, her hair will be lighter.