Crash Course Big History is back! It turns out, we couldn't tell all of the 13.8 billion years of the history of the universe in 10 Crash Course Episodes. So, Big History host Emily Graslie has returned to add 6 more episodes that look at why the stuff we studied in Big History matter. Today, we're starting with a look at why Cosmic Evolution matters. What exactly does the process of the big bang, the formation of stars, and the birth of planets mean to our lives? Let's find out together.

So, the stars made the elements, we're all made of star stuff, etc. But what does all this mean? This week Emily Graslie teaches you how the formation of chemical elements in the bellies of the earliest stars made life as we know it possible. Namely, we'll be learning about lowly carbon, which it turns out, is kind of a superhero when it comes to the rise of complexity.

Today we're talking about evolution–basically the history of all life on Earth. The thing is, why are we talking about this. Well, the story of life, all the way back to single celled microbes billions of years ago, is all part of our human story. An important facet of the story of life is the story of death. This episode will look at the various mass extinctions along the way, and we'll also talk about the sixth mass extinction, which is going on now, and is kind of driven by humans. Sorry everybody.

This week on Crash Course Big History, Emily is talking about process of human evolution, and the knack for innovation that has allowed humans to become so dominant on the Earth. Human innovation, and the ability to build on those innovations generation after generation is what makes humans different than other animals. Collective learning is enabled by our highly evolved and efficient ability to communicate with each other and pass on information. With great power, of course, comes great responsibility, and how we use this powerful tool has kind of a mixed track record.

This week, Emily Graslie is teaching you about human ancestry and geneaology, how we got to be the species we are, and why that matters in our zoomed out look at Big History.