IO TU Delft Course TfCD: Bendable Bladeless Desktop Fan
$5 Powerful DIY Fume Extractor
ESP8266 WiFi Module for Dummies
3D Printing Pen Tutorial
activated coal is one of the few materials that does not trigger a body reaction, ea. compare the activated coal you just eat when you're poisened. However too small is never good, their are granulated coal types, normally used in cars to get rid of petrol vapors existing in the fuel tank, moreover clean air frames formed of activated carbon are used in houses to perform the same. Dependant on where you live you might find a activated carbon source to be used.
Arduino controlled power supply source
Arduino Wildlife Night Camera
DIY Pet stairs/steps
Build a Lab Quality (ish) Distillation Apparatus.
How to make moonshine
10 unusual uses for sugar
Self watering vertical garden with recycled water bottles
Hack a $30 WiFi Pan-Tilt Camera - Video, Audio, and Motor control with Python
Chocolate, the physical side
Printed Wooden Panels for Your Home (or how to decorate your house like a nerd)