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Billionaires are backing top scientists racing to develop tech that could reverse aging. Cellular reprogramming promises to rejuvenate the body — but how does it work, and is it safe?
Joey Hadden/Business Insider
AP Photo/Ben Margot

The natural world is full of wonder. Life thrives in its every corner, from the abyssal depths of the oceans to the loftiest heights above Earth’s mountains.
Taylor Rains/Business Insider

Billions of years of evolution has given rise to us, the millions of species that persist on planet Earth today. Some of us are small, some of us are big, and some of us have huge ears, flat tails, compound eyes, or infrared vision.
Zach Griff