It turns out life may have gotten its start pretty early in Earth's history, and while the first couple billion years saw several important developments, the period was still dominated by very simple life forms. This is our first...

From the Archean Eon to the Holocene Epoch, check out this SciShow mini-series for a primer about life on earth.

The group of bacteria known as Chlamydiae doesn't do much to endear itself to us since these bacteria can cause a variety of illnesses. But it turns out that we may have Chlamydiae to thank for life as we know it!

By looking at the layers beneath our feet, geologists have been able to identify and describe crucial episodes in life's history. These key events frame the chapters in the story of life on earth and the system we use to bind all these...

The cell nucleus is crucial to multicellular life, so you think science would have a good idea how it evolved. The truth is, we don't, but Scientists do have some theories, including invading giant viruses!

If we are going to learn about the Earth, we had better start from the beginning! The Hadean, Archean, and Proterozoic eons will take us all the way from the formation of the Earth, 4.6 billion years ago, until about half a billion years...