These are really common on eBay. For something so cheap the devices are surprisingly sophisticated. Any thoughts on the probe material and function? If you enjoy these videos you can …
What actually causes the heat in your PC. How could we have a smaller, faster computer? Superconductivity! Credits: Hosting & Scripting: Footage: Images:
This is water conductivity experiment. Pure water is not conductive, because it has very little ion. However, if you add the salt, the salt is ionized, and water is become …