Scientists are trying to understand how complex life emerged on Earth about 2 billion years ago. Our microbial ancestors could be the key.
A study on wild northern cardinals shows that stress can change gut microbes and affect bird health in measurable ways.
A coral reef in Honolulu, Hawaii. Half of global coral coverage has disappeared since the 1950s. Donald Miralle via Getty Images Imagining a coral reef might bring to mind scenes teeming with fish, ...
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