How to turn pressure into vacuum!

If you ever need to create a vacuum but can’t find a vacuum pump, there’s a neat trick you can use in order to turn an air compressor into a vacuum pump, using only cheap and easy materials. As this video from GREENPOWERSCIENCE, this technique can also be used in order to spray liquids even if it contains particle that would be to big for any normal sprayers nozzle. GREENPOWERSCIENCE Used this very technique to turn styrofoam into spiderweb and you can watch how here: Recycle your styrofoam!

Making a photoresistor play music!

Photoresistors are very common electronic components that works like a normal resistor in total darkness, but as soon as light is hitting it, it changes. Increase the amount of light and the change will increase as well. This phenomenon is commonly used to detect when a light beam is broken, turning them into a light controlled switch. But did you know that they can also be used to make music? In this video Make: magazine walks us through a simple build that results in an electronic slide-whistle! Basically you transform light into music, and if you don’t think that is a cool idea, then what is?!