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Uranium Glass Ball
New
Out Stock

In the past, glass manufacturers added uranium to glass for color. Uranium has since become more strictly regulated, but the old uranium glass objects are still floating around. Because of the uranium content, these marbles glow bright green under ultraviolet light.  Size is around ⅞ – 1” diameter. Some dents and manufacturing imperfections can be expected. Slightly radioactive, but they're harmless. Makes... More info

$5.00
Tube of 20 Neodymium Magnets
New
Out Stock

Our mighty 4mm cubic rare earth magnets are incredibly useful, mesmerizing to fiddle with, and a steal for only 5 bucks for a tube of 20. We had these custom manufactured to the highest magnetization the factory could concentrate into the small space.  Made from a neodymium (Nd) alloy, these magnets each have about a 4lb pull (direct metal-to-metal contact).... More info

$5.00
Shashibo Box
New
Out Stock

Can you create more than 70 shapes? Unlock the mystery of Shashibo! Each Shashibo is powered by 36 rare earth magnets. 1 cube transforms into over 70 shapes. Combine 2 or more Shashibos to build larger shapes and create more possibilities. Can you master the shape shifting box? Collect & combine them all! Magnetic puzzle cube Transforms into over 70 geometric shapes Each Shashibo... More info

$19.99
Aerogel
New
-22%
Out Stock

Aerogel is one of the most impressive materials humans have created...so far. This vial contains 25mL (approximately 1 heaping handful) of silica aerogel particles—the world's lightest known solid material. Commonly called "frozen smoke", it is safe to touch, hydrophobic (repels water), and an outstanding insulator. This is one of our most popular items and essential for any science enthusiast's collection.... More info

$16.00$12.50
Martian Regolith Simulants
New
Out Stock

Martian Regolith Simulant: This tube of reddish material is engineered regolith to be chemically and mechanically identical to that of planet Mars. Regolith is a mixture of dust, soil, broken rock and other organic materials. NASA uses this material to test their rovers' performance abilities on the planet and to determine how well crops can be grown on Mars. This composition,... More info

$5.00
Skew Dice
New
Out Stock

These wacky-looking dice are actually just as fair as regular dice. Unlike other dice, Skew Dice aren't mirror symmetric. This means they come in two distinct forms that are mirror images of one another. Skew Dice are based on the trigonal trapezohedron. (A cube is a special case of a trigonal trapezohedron.) The faces are distorted in such a way that they remain... More info

$5.95
Lunar Dust Simulant
New
Out Stock

This vial contains simulated moon dust. It was engineered to be chemically and mechanically identical to the surface of ancient volcanic plains on the Moon, called maria. The particle size and composition was designed to match that of the samples returned from the lunar mare during the Apollo missions. This sample was produced by the non-profit ExolithLab at the University of Central... More info

$5.00
Water Beads
New
Out Stock

These tiny beads are made of a super absorbent polymer that can soak up a surprising amount of water. Plus, since they are almost entirely water when full absorbed, they have the same refraction index as water and become invisible   Put in your plant’s soil to avoid over-watering. Create your own diapers. Fill a vase and put something in... More info

$3.00
Rattleback
New
Out Stock

A rattleback is a type of spinning top that prefers to spin in one direction due to its unique semi-ellipsoidal shape. When spun in the wrong direction, it will automatically shift the momentum until it spins the opposite direction. This is caused by an asymmetrical mass distribution and the instability between the rotational axes. As the mass shifts, the rolling... More info

$2.50
Storm Glass
New
-26%
Out Stock

Originally made famous by Admiral FitzRoy, the captain of the HMS Beagle which Charles Darwin made his renown voyage upon, this sealed glass contains a solution that can form various crystalline structures, even filling the glass at times. This behavior was long thought to be indicative of the current weather conditions; however, these devices are now known to have little... More info

$15.95$11.95
Tippe Top (Wood)
New
Out Stock

This spinning top has a surprising behavior. When spun, it will invert itself to spin upside down until it loses momentum. This interesting gyroscopic effect is generally credited to surface friction. This small friction causes a torque which gradually rotates the sphere on a second axis and forces it up onto the stem. Note the direction of rotation before and after... More info

$2.00
Tungsten Black Hole Model
New
Out Stock

Over 200% funded on Kickstarter! If you compress any amount of mass, it becomes denser. If you compress it enough, it will become so dense that light can no longer escape it—this size is the object’s Schwarzschild radius. An object that is compressed smaller than this radius is a black hole. This tungsten sphere has been engineered to have exactly the... More info

$40.00
Solids of Constant Width (Set of 3)
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Out Stock

These solids of constant width behave like spheres. This is because, regardless of the peculiar shape, the diameter is still equal at every point. You can demonstrate this property by setting a flat object, like a book, on them and it will roll as smoothly as if the object were on spheres. Additionally, these wonky shapes won't roll away. The precise shape is an orbiform... More info

$9.95
Retroreflective Glass Beads
New
Out Stock

These microbeads are retroreflective beads—tiny glass spheres designed to effectively reflect light back to the light source. They are commonly applied to wet paint to create reflective surfaces and markings. They work by allowing light to pass into one side of the sphere, reflect off the opposite side, and return to the source in the color of the paint used. The type of glass... More info

$5.95
Silicon Wafer
New
Out Stock

Wafers are thin sliced semiconductors used to manufacture microelectronics and computer components. This sample is an 8" uncut silicon wafer with integrated circuits. Each wafer contains thousands of duplicate photo-lithographed circuits. Typically this wafer would have been cut up and the individual components would be installed in cell phones, satellite, computers, etc. This item is very fragile, so handle with care. ... More info

$19.95
Liquid-Filled Top
New
Out Stock

We don't usually carry religious paraphernalia, but we had to make an exception for these liquid-filled glass dreidels. When spun, the colored water in the internal cavity exhibits interesting physics to keep the top spinning. Includes stand.Dimensions: 3" tall x 1 ½" diameterMore info

$12.00
Magnetic Hourglass
New
Out Stock

Keep track of time in style with this magnetic hourglass. Lasting one minute (it should actually be called a minuteglass, but I digress), this "hourglass" contains ferrous sand. With a magnet hidden in the wooden base, watch beautiful stalagmites form as the seconds pass by. Beautiful stalagmite magnetic hourglass Ferrous sand, combined with hidden magnet, create beautiful stalagmites One minute... More info

$20.00
Hot Surface Indicator
New
Out Stock

This 1.5" yellow label is a temperature-sensitive indicator that appears blank when cold, but reveals the word “Hot” and a warning graphic when the surface to which the label is adhered exceeds 50 °C (122 °F). The graphic contains a non-toxic mixture of liquid crystal esters that react to the heat and change colors. The chemical reaction is reversible. Once... More info

$2.50
Tippe Top (Aluminum)
New
Out Stock

This spinning top has a surprising behavior. When spun, it will introvert itself to spin upside down until it loses momentum. This interesting gyroscopic effect is generally credited to surface friction. This small friction causes a torque which gradually rotates the sphere on a second axis and forces it up onto the stem. Note the direction of rotation before and after... More info

$11.00
Horseshoe Magnet
New
Out Stock

Powerful 3" alnico horseshoe magnet. Magnets are painted red with north pole marked.More info

$6.95
Magnetic Field Demonstrator
New
Out Stock

This is a quick and clean way to visualize magnetic fields. The demonstrator is a transparent acrylic case that holds iron filings suspended in a fluid of mineral oil. When it is placed over a magnet, the field pattern can be viewed directly, or it can be placed on an overhead projector for classroom demonstration. Dimensions: 8.75" x 4.75" x... More info

$29.95
Refractive Projection Lens
New
Out Stock

If you look closely, you can see the slight curves on the acrylic surface of this lens. They may not look like much, but they have been precisely arranged to bend the light passing through the lens to form the image projection. This is not a hologram, but a form of projection that uses the physics of how light behaves when passing... More info

$19.95
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