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Mercey Livingston is a health and wellness writer and certified Integrative Nutrition Health Coach. She's written about fitness and wellness for Well+Good, Women's Health, Business Insider, and ...

Most creatures need oxygen to provide the power to sustain life. It is what enables their cells, hearts, and minds to function. For humans and most creatures, a few minutes of zero oxygen is death.

Neural tissue normally dies quickly without oxygen. Yet bird retinas—among the most energy-demanding tissues in the animal kingdom—function permanently without it. This may be relevant in future ...