Today, there are many ways to conceive a child, thanks to assisted reproductive technologies like IVF and egg-freezing. But the law lags behind these advancements, says attorney Ellen Trachman, troubling parents-to-be with...

In 1967, Moshe Safdie reimagined the monolithic apartment building, creating “Habitat ’67,” which gave each unit an unprecedented sense of openness. Nearly 50 years later, he believes the need for this type of building is greater than...

If you live in the United States, you may live in the Eastern Standard Time Zone. Or maybe you live in Mountain Standard Time or one of the other standardized time zones. But these time zones have not always been around. In fact, it's a...

With scissors and paper, artist Béatrice Coron creates intricate worlds, cities and countries, heavens and hells. Striding onstage in a glorious cape cut from Tyvek, she describes her creative process and the way her stories develop from...

The feeling of security and the reality of security don't always match, says computer-security expert Bruce Schneier. In his talk, he explains why we spend billions addressing news story risks, like the "security theater" now playing at...

Mountains take can take billions of years to form, but the Adirondack Mountains got ahead by recycling itself.

In a series of visual, animated love letters, designer Debbie Millman reflects on the things she's grateful for by exploring the wonders of her garden, New York City, travel and storytelling. "As we navigate through this crisis, I'm...

Some scientists say we’re in the midst of Earth’s sixth mass-extinction event, caused entirely by us. But some animals have a knack for surviving in a human-dominated world. What’s their secret?

400 years after Hudson found New York harbor, Eric Sanderson shares how he made a 3D map of Mannahatta's fascinating pre-city ecology of hills, rivers, wildlife -- accurate down to the block -- when Times Square was a wetland and you...

Hank sits down with clinical sexologist Dr. Lindsey Doe and talks about 'fighter sperm'. Then Jessi from Animal Wonders comes on to show off her Quaker Parrot the 'monogamous bird'.

In a deeply moving letter to her grandmother, Xiye Bastida reflects on what led her to become a leading voice for global climate activism -- from mobilizing school climate strikes to speaking at the United Nations Climate Summit...

In a deeply moving letter to her grandmother, Xiye Bastida reflects on what led her to become a leading voice for global climate activism -- from mobilizing school climate strikes to speaking at the United Nations Climate Summit...

Luckily, we live in a time where we don't have to worry about smallpox anymore. It's a horrible disease, but through smart vaccination techniques, we took it from killing millions worldwide, to being eradicated from the planet!

Legendary architect Renzo Piano -- the mind behind such indelible buildings as The Shard in London, the Centre Pompidou in Paris and the new Whitney Museum of Art in New York City -- takes us on a stunning tour through his life's work....

The moon may be 1.3 light-seconds away, but why on earth do we measure distances using time?

Today we’re learning about Marsha P. Johnson and the Stonewall rebellion. Serving as a pivotal moment in the modern Gay Rights Movement, Stonewall began on June 28th, 1969, and lasted six days in New York City’s Greenwich Village. And...

Isabella Baumfree was born into slavery in late 18th century New York. Fleeing bondage with her youngest daughter, she renamed herself Sojourner Truth and embarked on a legendary speaking tour. She became known as an electrifying orator...

In which John Green teaches you about Vikings! That's right, one of our most requested subjects, the Vikings, right here on Crash Course. So what's the deal with Vikings? Well, the stuff you've heard about them may not be true. The...

The famous symptomless carrier of Typhoid Fever, Mary Mallon, never felt the effects of the fever, but never recovered from a medical system that didn’t know how to treat a carrier of the disease.

Nicole Paris was raised to be a beatboxer -- when she was young, her father, ed Cage, used to beatbox her to sleep at night. Now the duo is known for their beatbox battles and jam sessions, which mix classic rap beats with electronic...

New ReviewVisit Monmouth Battle state park in New Jersey to learn about one of the largest battles of the American Revolution.

New ReviewVisit Washington Crossing Historic Park in Pennsylvania to learn how George Washington and the Continental Army won the Battle of Trenton.

New ReviewThe video features four renters who demonstrate how to maximize small living spaces, starting with a look back at the transformations.

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