Art Woods introduces us to Antartica's enormous sea spiders and Jessi from Animal Wonders brings in Fluffy the Chilean Rose Tarantula, a surprisingly big land spider.

In 2014, Erika Cheung made a discovery that would ultimately help bring down her employer, Theranos, as well as its founder, Elizabeth Holmes, who claimed to have invented technology that would transform medicine. The decision to become...

Luck is rarely a lightning strike, isolated and dramatic -- it's much more like the wind, blowing constantly. Catching more of it is easy but not obvious. In this insightful talk, Stanford engineering school professor Tina Seelig shares...

Emily Graslie of The Brain Scoop is back again to stump Hank and to tell us about some fascinating new research in the field of rat telepathy (NO JOKE). Then Jessi from Animal Wonders shares Zoe the Red-lored Amazon parrot.

Author, philosopher, prankster and journalist AJ Jacobs talks about the year he spent living biblically -- following the rules in the Bible as literally as possible.

How do you know you're real? Is existence all just a big dream? Has some mad scientist duped us into simply believing that we exist? James Zucker investigates all of these questions (and more) in this mind-boggling tribute to Rene...

Last year LIGO announced the detection of gravitational waves from the merger of two black holes. The science world went a little crazy. Only a few weeks ago a new rumour emerged: that LIGO had, for the first time, spotted gravitational...

Why do cats love catnip so much? Researchers have found a possible evolutionary answer to this adorable feline phenomenon!

Hank talks about the scary new drug that's led to some recent incidences of goat stabbing, as well as other tragedies - bath salts. We learn how it works and ask the important question: why?

Hank talks about a few - maybe crazy, maybe reasonable - geoengineering schemes that some scientists have come up with in order to "fix" climate change, including designer clouds, ocean fertilization, and stratospheric shading with...

Scott Dinsmore quit a job that made him miserable, and spent the next four years wondering how to find work that was joyful and meaningful. He shares what he learned in this deceptively simple talk about finding out what matters to you —...

Virtuoso Pamelia Kurstin performs and discusses her theremin, the not-just-for-sci-fi electronic instrument that is played without being touched. Songs include "Autumn Leaves," "Lush Life" and David Mash’s "Listen, Words Are Gone."

When you think of fangirls, what comes to mind: large swaths of fandom (usually for a boyband) whose feelings culminate in tears and joyful screams? Perhaps you grimace or roll your eyes at the thought. In this fun, lively talk,...

What's haunting Carrie Poppy? Is it ghosts or something worse? In this talk, the investigative journalist narrates her encounter with a spooky feeling you'll want to warn your friends about and explains why we need science to deal with...

Just how small are atoms? And what's inside them? The answers turn out to be astounding, even for those who think they know. This fast-paced animation uses spectacular metaphors (imagine a blueberry the size of a football stadium!) to...

* Viewer discretion advised. This video includes discussion of mature topics and may be inappropriate for some audiences. In love, we fall. We're struck, we're crushed, we swoon. We burn with passion. Love makes us crazy and makes us...

The universe is huge and getting bigger all the time, and we have we have dark energy - the most mysterious force in the universe - to blame/thank for it. Thought to make up more than 70% of the energy in the whole universe, Hank...

We're raising our girls to be perfect, and we're raising our boys to be brave, says Reshma Saujani, the founder of Girls Who Code. Saujani has taken up the charge to socialize young girls to take risks and learn to program -- two skills...

In this tutorial I show how I synthesized the sound of hydrogen for the "Sound of Hydrogen" video using mathematica - it's a little technical, but you've been requesting it!

We start this new decade knowing that it is the most consequential period in history, says Prince William, The Duke of Cambridge. Inspired by President John F. Kennedy's "Moonshot," he calls on us all to rise to our greatest challenge...

Are you afraid of black cats? Would you open an umbrella indoors? How do you feel about the number 13? Whether or not you believe in them, you're probably familiar with a few of these superstitions. But where did they come from? Stuart...

Here's a talk about tears -- and why crying isn't something to be afraid or ashamed of. Exploring the science behind the mood-boosting power of crying, childbirth and lactation educator Kathy Mendias shows how tears can enhance your...

In this video Paul Andersen explains how the dimensions of space and time are combined in relativistic mechanics. Gravity and velocity can affect both space and time according to Albert Einstein's Special Law of Relativity.

Nick Jenkins talks with Hank Green about selective breeding, with special guest Jessi Knudsen Castañeda.