You can draw on an iPad with an Apple Pencil on the Procreate app, which you can use to sketch, paint, and illustrate.

It's easy to make a working stylus for your tablet or mobile device with just a few household supplies, including an ink pen and cotton swab.

The science pros at The King of Random start a fire using just a pencil and sunlight.

Abstract: The intelligent fault diagnosis (IFD) methods obtain superior performance in ensuring the safety of mechanical systems, but varying working conditions degrade the performance of intelligent ...