Wonderfully well crafted and available from this shop :
From Etsy store TheSmallestWorkshop:
BUY NOW Hydrophobic Water Maze
Hydrophobic Water Maze: a superhydrophobic coating allows this dynamic puzzle to use a drop of water as the "pinball", which can split into multiple smaller drops and recombine along the way. The wood surface is treated with silica nano-coating that makes water roll off- a condition sometimes referred to as the Lotus effect because leaves of the Lotus plant have this property.
Get this 3D printed object of math topology here:
From Etsy: BUY NOW: Mobius Strip with Arrow
Arrow on Möbius Strip: on the geometry of a Möbius strip a right pointing arrow points left after one trip around, a second trip restores the original orientation. This mathematical property is called non-orientability, and is also true of Klein bottles which I’ve posted about. I love how this 3D printed model, designed and produced by Wes Pegden, allows one to physically manipulate and intuit this somewhat obscure mathematical property.
I found this vintage apparatus on eBay. Here is a similar device made for classroom demonstrations (a bit pricey though):
From Amazon: BUY NOW
Wilson Cloud Chamber
Diffusion cloud chambers that use dry ice are more affordable:
From Etsy: BUY NOW
Diffusion Cloud Chamber
Wikipedia has nice descriptions of Am-241 and the history and operation of Wilson Cloud Chambers
Am-241 in Wilson Cloud Chamber: the typically invisible ionization tracks of alpha particles emitted from a radioactive source are revealed in this miniature expansion type cloud chamber. When an americium nuclei disintegrates it ejects a high speed cluster of protons and neutrons (2 of each) called an alpha particle which then plows through the air creating a trail of ions, tearing electrons off any nearby molecules it passes by. A rapid decrease of pressure (releasing the squeeze bulb) drops the temperature in this chamber allowing cloud formation. Alcohol droplets prefer to condense on ionized molecules/atoms and so reveal the tracks. Amazingly the synthetic element americium-241 is found in common smoke detectors, where a few micrograms will emit thousands of alphas per second. Of course please use great caution if you choose to mess around with any Am-241- it’s safe inside the smoke detector, much less so if removed.
Many animations to choose from:
From Etsy: BUY NOW Cinspinner Animation
CineSpinner: motion animation from Moiré pattern effects of constructive and deconstructive interference. Affordable kinetic art by Scanimation creator, artist, and author Rufus Butler Seder.
Each glass is unique and comes with tesla coil base:
From Etsy: BUY NOW: Neon Glow Glass by TeslaCoilPro
Neon Plasma Glass: these double walled glass mugs glow orange and blue from the excitation spectrum of neon gas at low pressure. The base contains a high frequency transformer (Tesla coil) that generates high voltage electric fields (but at very low current) from USB rechargeable batteries- which excites the neon to glow, and also serves as a coaster. The inner volume varies in thickness which leads to variations in heat and pressure which in turn produces different excitations (orange and blue) of the neon gas in patterns that dance and dazzle the eye. Stunningly beautiful kinetic art and tech by creator Zerg Dragonymous.