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All mammals share certain characteristics, like warm blood and backbones. But despite their similarities, these creatures also have many biological differences - and one of the most remarkable differences is how they give birth. Kate Slabosky details the placental, marsupial, and monotreme methods of giving birth.

Karl Marx remains deeply important today not as the man who told us what to replace capitalism with, but as someone who brilliantly pointed out certain of its problems. The School of Life, a pro-Capitalist institution, takes a look.

Why are some people racist, but others are not?

The biggest problem for the climate change fight isn't technology - it's human psychology.

Lissa Rankin, MD is an OB/GYN physician, author, keynote speaker, consultant to health care visionaries, professional artist, and founder of the women's health and wellness community OwningPink.com. Discouraged by the broken, patriarchal health care system, she left her medical practice in 2007 only to realize that you can quit your job, but you can't quit your calling. This epiphany launched her on a journey of discovery that led her to become a leader in the field of mind/body medicine, which she blogs about at OwningPink.com and is writing about in her third book Mind Over Medicine: Scientific Proof You Can Heal Yourself (Hay House, 2013).

Pain helps us survive, and yet some people are born without the ability to feel pain, how?

Why Google search once said Obama was a king and dinosaurs weren't real.

Including toasters, radios, and microwave ovens, there have been a number of life-changing household breakthroughs through the years. Follow along to see the smartest appliances and laborsaving devices that have emerged in the last century.

Over a hundred years after his creator was laid to rest, Dracula lives on as the most famous vampire in history. But this Transylvanian noble - neither the first fictional vampire, nor the most popular of his time - may have remained buried in obscurity if not for a twist of fate. Stanley Stepanic explains how a critical copyright battle catapulted Bram Stoker's character into literary renown.

Nietzsche believed that the central task of philosophy was to teach us to 'become who we are'. Find out more by reading our book 'Life Lessons from Nietzsche '

Friendliness is a great virtue. Over-friendliness can be an unexpected problem.

Supercapacitors: They'll enable you to charge your cell phone in 5 seconds, or an electric car in about a minute. They're cheap, biodegradable, never wear out and as Trace'll tell you, could be powering your life sooner than you'd think.

We see police sketches in the news all the time, but do they actually work?

Of all the species that humans have domesticated, dogs are our oldest animal friends. But how did a group of wolves become the furry pup at the end of the bed? New research is finally unlocking the paw-in-hand evolution of dogs and humans. In this episode we're answering one big question: Did we domesticate dogs, or did dogs domesticate us?

Watch Jean-Claude Van Damme carry out his famous split between two reversing trucks. Never done before, JCVD says it's the most epic of splits -- what do you think?

Incredible before-and-after satellite images of our dynamic planet.

Academy Award winners Sandra Bullock ("The Blind Side," "The Proposal") and George Clooney ("Up in the Air," "Syriana") star in "Gravity," a heart-pounding thriller that pulls you into the infinite and unforgiving realm of deep space.

Cheetahs are fast, but not faster than a diving peregrine falcon.

Star Wars: The Last Jedi. Arriving in your galaxy December 15.

The average person experiences dozens of individual itches each day. We've all experienced the annoyance of an inconvenient itch - but have you ever pondered why we itch in the first place? Is there actually an evolutionary purpose to the itch, or is it simply there to annoy us? Emma Bryce digs deep into the skin to find out.

Beyond what we can touch, taste, smell, and hear, we experience the universe through light. But how did we come to discover light, and how did we learn light's true nature, as the fastest thing in the universe, an electromagnetic spectrum, a wave and particle capable of the most amazing things? Here is the history of light, according to physics.