Scientists discovered complex life may have started 1.5 billion years earlier than previously thought thanks to phosphorus.

colliding 2.1 billion years ago, according to the study. "The availability of phosphorus in the environment is thought to be a key component in the evolution of life on Earth, especially in the ...

They emerged no later than 1.8 billion years ago and slowly diversified over the ensuing "boring billion" years—a stretch from 1,450 to 720 million years ago marked by low species turnover rates.

WASHINGTON (AP) — Early humans were regularly using animal bones to make cutting tools 1.5 million years ago. A newly discovered cache of 27 carved and sharpened bones from elephants and hippos found ...