These articles explore evolution - the changes seen in the inherited traits of a population from one generation to the next. Evolution is one of the great mysteries of biology, since it is a slow process and difficult to study.
Imagine a time in Earth's far-flung past when organisms didn't swim through the oceans or populate the lands. Even the mighty dinosaurs hadn't arisen. Will the planet ever return to that lifeless state?
"It is as hard to see one's self as to look backwards without turning around," wrote Thoreau -- an odd quote from someone who's known for living alone in the woods. "Know thyself"? As it turns out, it's harder than it sounds.
Variety is the spice of life. Absent the amazing diversity of organisms that calls Earth home, it would be a deadly boring place. How did we get to a point where Komodo dragons, giraffes and butterflies all compete for space on the same planet?
When a basketball superstar makes a 3-pointer, the multimillion-dollar paychecks go into his or her bank account. But why don't his or her parents get the glory? After all, didn't they provide the DNA that allowed for such incredible success?
We don't admit to breaking up with someone because of his looks, or that we've read our boss's private e-mails. We answer "fine" when someone asks how we are, even if we're not fine at all. Why is polite society all about the big fib?
Why do we dream? Why do we believe? Why are we curious? During the 60-part documentary series, "The Curiosity Project," Discovery Channel investigates and tries to answer many of life's great questions.
When Australia became separated from the other continents, its species evolved in isolation. And yet, some of the Australian animals evolved in exactly the same way as the other animals in the world. How?
Whether they're big or small, extinctions change the world. And while extinctions themselves are all about change, the study of extinction is all about uncertainty. Anything that lives can become extinct, but how do scientists know when it happens?
One kind of flatworm doesn't have a working mouth, because the algae that lives inside of it makes food for the worm. Symbiosis is crucial to the survival of many species. In fact, you're a symbiote yourself.