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Topic: how things work
Introducing the Dial Telephone, films from 1936 & 1954
Have you ever heard a dial tone or a busy signal? How did we call someone before speed dial and push-button telephones, but after people stopped needing to speak with a switchboard operator? Behold the rotary dial: ...
What causes constipation?
Visiting the bathroom is part of the daily human experience. But occasionally, constipation, a condition that causes a backup in your digestive system, strikes. In some especially uncomfortable cases, the food you eat...
Math in Motion: Playing with a desktop Galton Board
This delightful little device brings to life the statistical concept of normal distribution. As you rotate the Galton Board on its axis, you set into motion a flow of steel beads that bounce with equal probability to ...
What’s the difference between hibernation and sleep?
The Arctic Ground Squirrel hibernates by burrowing under the permafrost and slipping into a state of suspended animation. The female black bear can give birth while she hibernates. The fat-tailed dwarf lemur prepares ...
Which is stronger: Glue or tape?
The oldest glue in the world is over 8,000 years old and comes from a cave near the Dead Sea. Today, we have enough types of tape and glue to build and repair almost anything. But what gives glue and tape their sticki...
The Very Hungry Maggot: How larva farming can help reduce food waste
How are maggots like waves in an ocean? How are they like puppies? In this fascinating Macroscope video from Science Friday, The Very Hungry Maggot, we meet David Hu, a mechanical engineering professor who's studying ...
Nature’s Masters Of Disguise – Maddie About Science
Go behind-the-scenes at the Smithsonian Museum of Natural History with arachnologist Hannah Wood and Maddie About Science host Maddie Sofia to see the mimics of the museum's collection. Atlas moths, stick bugs, leaf i...
Evolution 101 & how natural selection works – NOVA PBS
What is evolution, how has it created Earth's biodiversity, and how can a phylogenetic or evolutionary tree—a tree of life—help us better understand how different species are related? Learn some basics from this Evolu...
The infinite life of pi
The ratio of a circle's circumference to its diameter is always the same: 3.14159... and on and on (literally!) forever. This irrational number, pi, has an infinite number of digits, so we'll never figure out its exac...
The Science of Skin
Between you and the rest of the world lies an interface that makes up 16% of your physical weight. This is your skin, the largest organ in your body: laid out flat, it would cover close to 1.7 square metres of ground....
Making Artificial Earthquakes with a Four-Tonne Steel Ball
In Göttingen, Germany, there's a four-tonne steel ball that can be raised up a 14-metre tower -- and then dropped in less than two seconds, crashing back to earth. It makes tiny, artificial earthquakes. Tom Scott v...
Transforming Human Poop Into Eco-Friendly Fertilizer
Everyone poops. But not everyone around the globe has access to a clean toilet. Some communities in Haiti have set up a clean and healthy sanitation system that can also provide a homegrown resource for boosting food ...
The Engineering of the Drinking Bird
How is a drinking bird like a heat engine? In this video from Engineer Guy Bill Hammack, we can see how this famous drinking/dipping bird toy "exploits a temperature difference to convert heat energy to a pressure dif...
The surprising interactions between copper and neodymium magnets
Experiments with super strong neodymium magnets and copper! These surprising demonstrations of magnetic damping go beyond the magnet through a copper tube demo that we've previously seen. Watch as Night Hawk in Light ...
This giant plant looks like raw meat and smells like dead rat
This gigantic flower, native to western Sumatra and infamous for smelling like something rotten, is the corpse flower or titan arum, and it's not really a single flower. The flowers are at the base of the tall spadix ...
The record-breaking tongue lashing of the chameleon
It’s no secret that chameleons possess remarkable tongues. Aristotle first described the breathtaking speed of chameleon tongue projection around 300 B.C. But the tongue lashings these lizards deliver to unsuspecting ...
Universal Calendar Puzzle: Figure out the day of the week for any date ever
Learn how to calculate the day of the week for any date you can think of with this impressive mental trick and some practice. In this It's Okay to Be Smart video, Universal Calendar Puzzle, Joe Hanson demonstrates the...
How does a penguin launch itself from the sea?
How do emperor penguins launch themselves out of the sea at twice their normal swimming speeds? A mix of biology and physics sends this flightless bird flying... at least briefly: Penguins trap microbubbles within the...
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