Tag «Hank»

Why Do People Have Periods When Most Mammals Don’t?

[♪ INTRO] Humans have been getting their periods since, well, forever. So you might think that’s just something that comes along with being a mammal. But… it’s not. Few mammals get periods every month, or at all. Like, that bleeding thing that female dogs do? It’s not menstruation. It comes from the vagina, not the …

The Curious Case of Colic

The Curious Case of Colic

[♪ INTRO] Babies cry a lot. Which can be really irritating, but it’s normal. It’s the only way they can tell you they’re hungry. Or bored. Or tired. Or… you get the idea. But some babies do cry more than others. And when an otherwise healthy baby cries more than normal, they’re said to have …

What Your Family History Can’t Tell You

What Your Family History Can’t Tell You

Thanks to the National Institutes of Health’s National Human Genome Research Institute for supporting this episode of SciShow. [♪ INTRO] The first time you visit a new doctor, they’ll probably ask about your family history. Everything from heart disease to certain cancers to type 2 diabetes—if one of your close relatives has had it, they …

A Brief History of Life: Rise of the Humans

A Brief History of Life: Rise of the Humans

Today we’re going to conclude our miniseries about the history of life on Earth by talking about the Cenozoic era, from 65 million years ago to the present. Cenozoic means “recent animals,” which makes sense, since it’s the era we’re still in. During the Cenozoic, animals and plants and everything else evolved to the forms …

Bitcoin: How Cryptocurrencies Work

Bitcoin: How Cryptocurrencies Work

Say there’s a coin that’s currently worth hundreds of U.S. dollars, but it’s not made of gold, or platinum, or any precious metal. In fact, it’s not the kind of coin you can hold in your hand or stick in a piggy bank. It’s a digital currency, which means it only exists electronically. I’m talking …

The Fog That Killed 12,000 People

The Fog That Killed 12,000 People

[♪ INTRO] London is famously foggy. Sometimes that can mean a wistful stroll or another excuse for a cuppa tea, but when fog mixes with the smoke and chemicals produced by industry, it becomes something new: smog. And for a couple of centuries, London’s smog could kill. Really bad smogs could kill a thousand people …

Bad Science: Breast Milk and Formula

Bad Science: Breast Milk and Formula

Thanks to Skillshare for supporting this episode of SciShow. [ ♪INTRO ] If you’ve had a baby in the last couple decades or so, you’ve probably been told that “breast is best.” That you should make sure your baby gets only breast milk for the first six months of its life. It’s a saying that …

3 of the Biggest Experiments Ever

3 of the Biggest Experiments Ever

SciShow is supported by Squarespace. Whether you need a domain, website, or online store, make it with Squarespace [♪INTRO] It’s one of those fundamental rules of the universe that we all eventually learn growing up: like, life isn’t fair, Picard was a better starship captain than Kirk, and bigger isn’t always better. Sometimes though, there …

Is Alkaline Water Really Better For You?

Is Alkaline Water Really Better For You?

[ intro ] You may have heard of alkaline water— it’s the newest health trend hitting grocery shelves. These products are essentially just water treated to have a more basic pH between 8 and 10 instead of water’s usual neutral 7. And supposedly, they take your internal chemistry from acidic to alkaline, leaving you more …