# Topic:demonstration

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## The Shoe-Tying Robot

What might five mechanical engineering students create with two motors, Arduino, and a \$600 budget? How about a shoe tying machine? Winning an annual design competition with Japan's Meijo University, University of...

## Use a 9-volt battery to break water into its elemental components

In the 1987 miniseries The Ring of Truth: An Inquiry into How We Know What We Know, Philip Morrison proves that a water molecule is composed of two hydrogen (H) atoms & one oxygen (O) atom with a simple demonstration....

## Dressing in late 14th century armor

A video showing how to dress in and wear armor (harness) from late 14th century. The harness is a detailed reconstruction based on the effigy of the Black Prince (1330-1376) in the Canterbury Cathedral, other relevant...

## Observing the angle of repose with DIY physics devices

The angle of repose or critical angle of repose is how steep various types of materials can be piled without slumping. The steepness of the side of a pile is determined by the amount of friction between the particles ...

## How to collect black sand with a magnet

If you're ever at a beach with some black sand in the mix, run a magnet through the sand to see if the black sand sticks. Exploratorium educator Ken Finn demonstrates this experiment with a magnet and a plastic cup at...

## The Coupled Pendulum, a physics demonstration

See the simple laws of physics at work: Two pendulums swing on a string, transferring energy from one to the other and back again. This demonstration by MarkHacks, made with cardboard, screw hooks, tape, string, and t...

## How to make a DIY Duct Tape Coin Pouch

With an x-acto knife or scissors, a cutting mat or ruler, a ziplock bag, and two rolls of duct tape—pick two colors you like—you can create your own DIY Duct Tape Coin Pouch in less than 10 minutes. Sally shows us how...

## 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 ...

## How to make a turquoise goblet

How did the Venetians make turquoise glass in the late 1400s? Find out as Bill Gudenrath, glass specialist at the Corning Museum of Glass, uses traditional glass blowing methods to create a replica of the extremely ra...

## Speed up geologic time with a DIY squeeze box

Build. Observe. Play in the sand and dirt. Making your own easy-to-build squeeze box is fun for lots of different reasons, including educational ones. This Science Snacks video with Eric Muller from The Exploratorium ...

## Food of the Enslaved: Michael Twitty cooks recipes from American history

Historic interpreter and culinary historian Michael W. Twitty preserves and promotes the food traditions of enslaved African and African American communities in the 18th and 19th centuries. From the dishes he makes to...

## 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 ...

## 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...

## Getting dressed in 18th century England

What kind of garments did women wear in 18th century England? The above video from CrowsEye Productions, filmed for the Lady Lever Art Gallery just outside of Liverpool, shows the daily dressing routine of a working w...

## Liquid Sand Hot Tub: Making a giant fluidized bed of sand

When air is pumped through sand in just the right way, the sand begins to behave a lot like a fluid. As air escapes between the sand particles, items placed in the sand will begin to float. Others will sink. And when ...

## How to multiply numbers by drawing lines

Learn how drawing lines and counting can visually calculate multi-digit multiplication problems. This handy math trick, sometimes referred to as the Japanese Multiplication Trick, lets little kids, visual learners, an...

## Weaving on Mount Vernon’s 18th Century Loom

See how shirt fabric was woven on a four-poster wooden loom or barn loom in this demonstration at Mount Vernon, President George Washington's plantation home on the Potomac River in Virginia. Master weaver Melissa Wea...

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