This source introduces epigenetics, a revolutionary field that challenges the traditional belief that genes are the sole determinants of life. It explains that while DNA sequences remain constant, external factors like lifestyle, diet, stress, and experiences can influence how genes are expressed, acting as "switches" that turn them on or off. The document highlights how identical twins can have different life outcomes despite sharing the same DNA, illustrating the impact of these epigenetic modifications. Furthermore, it reveals that epigenetic changes can be inherited by future generations, emphasizing the profound influence our lives have on genetic expression. Ultimately, the text presents epigenetics as a second genetic revolution, offering a new understanding of health, disease, and the malleability of biological destiny.

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