Humans have explored the skies and oceans, carved tunnels by digging mountains, harnessed the power of electricity to generate light in the dark and performed the most fantastic feats. However, these same human beings sometimes become so helpless that they cannot take a few steps or hold a glass of water. Our vulnerability as a species is such that if our heart beats a little more or less than the average beats per day, we are on the brink of life. We eat and drink without hesitation, but the failure of a single component of our digestive system could be fatal.

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