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A fossil discovered in Ethiopia suggests that humans' prehistoric relatives may have lived in the trees for a million years longer than was previously thought.

You may not know his name, but chances are that you have seen his work. Brooklyn-born artist Charles R.

You may not know his name, but chances are that you have seen his work.

Sometime between three million and two million years ago, perhaps on a primeval sa

Sometime between three million and two million years ago, perhaps on a primeval sa

Humans have a seemingly primal need to understand how we came to be the way we are today. Pieces of our ancient forebears generally are hard to come by, however.

Humans have a seemingly primal need to understand how we came to be the way we are today. Pieces of our ancient forebears generally are hard to come by, however. Scientists working to interpret our evolution often have had to make do with studying a fossil toe bone here or a jaw there

Humans have a seemingly primal need to understand how we came to be the way we are today. Pieces of our ancient forebears generally are hard to come by, however.

By Deborah Zabarenko WASHINGTON (Reuters) - The world's oceans are turning acidic at what could be the fastest pace of any time in the past 300 million years, even more rapidly than during a monster emission of planet-warming carbon 56 million years ago, scientists said on Thursday. Looking back at that bygone warm period in Earth's history could offer help in forecasting the impact of human-spurred climate change, researchers said of a review of hundreds of studies of ancient climate records published in the journal Science. Quickly acidifying seawater eats away at coral reefs, which provide habitat for other animals and plants, and makes it harder for mussels and oysters to form protective shells.

New research suggests that one of the earliest horses started out small--then got even smaller. As temperatures rose 55 million years ago during the ancient Eocene epoch, a North American horse species shrank from the size of a small dog to that of a house cat.

Several Russian news outlets are reporting that Russian scientists have successfully drilled to Antarctica's Lake Vostok , a massive liquid lake cut off from daylight for 14 million years and buried beneath 2 miles (3.7 kilometers) of ice. [More]

Most humans think of the placenta as something that gets tossed out after childbirth. In fact, its appearance millions of years ago was a significant evolutionary development that gave rise to the vast majority of mammals alive today, from bats to whales to humans. Until now, scientists believed that placental mammals first appeared some 125 million years ago.

Most humans think of the placenta as something that gets tossed out after childbirth. In fact, its appearance millions of years ago was a significant evolutionary development that gave rise to the vast majority of mammals alive today, from bats to whales to humans

Rivers today have high muddy banks, sandbars and bends. But they didn’t always look that way

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