In this exciting DIY tutorial, learn how to make an electric helicopter using a simple plastic bottle and a DC motor.

Most plastic water bottles don’t make for easy cleaning, so it can be tricky. But if you must reuse one, it’s best not to skip this step.

Using PET bottles to make recycled polyester produces 75% fewer greenhouse gas emissions, compared to making new PET. You can tell whether a piece of consumer plastic is PET by looking for a number “1 ...