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Torus Drawing Machine
Thanks for reminding me that I have one of those already. It basically is a webcam with a lens in front of it. Don´t know if it can magnify 100X, or if the sensor is sensitive enough for low light conditions, but it is worth a try.
Do you think that if you attach a webcam to the microscope it would show the scintillations? That would make it easier to show what happens to the students. Thanks for the instructable. No smoke alarms here in Brazil, but I do have an Americium source at school, maybe I will try this sometime.
3D Printed Zipper Pulls
You just mix it with water, no need to heat it. It is an insoluble compound, but with a low density and a very fine powder, so it remains in suspension for a long time. Another thing that is important is the way it interacts with water and with its own particles. You can try to make the water more dense by dissolving a lot of salt in it. This article may be useful: https://aip.scitation.org/doi/pdf/10.1063/1.5045053. It shows how to make the fluid from shaving cream.
Make A Barbarian's Sword
How To Weave A Greek Paper "Football"