Sometime before 520 million years ago, animal life began to flourish as never before. The small shells, worms and even sponge-like enigmas of earlier eras suddenly unfolded into a new array of species ...

The internet erupted in controversy over Felisa Wolfe-Simon and colleagues’ claim of a microbe thriving on arsenic. Nearly 15 years later, she’s pursuing new research on the boundaries of life. Felisa ...

What if the pursuit of happiness isn’t the answer to living a fulfilling life? In a world where happiness is often framed as the ultimate goal, emotions like sadness, anger, and fear are frequently ...

It's tiny and needy, but is it alive? That's a question prompted by recent research that highlights a surprisingly complex part of biology. The organism in question is a microbe called Sukunaarchaeum ...

Has NASA's Perseverance rover at long last found evidence that life did indeed once exist on Mars? Here's what we know.