In the winter, a lot of people use space heaters to make up for faulty radiators, or just for an extra burst of warmth when getting dressed in the morning. However, space heaters use a lot of energy and can potentially crank up your electric bill. Engineer and YouTuber Desertsun02 created a non-electric space heater from a ceramic pot, a few nuts and bolts, candles, and bricks. Check it out for yourself in the video below.
(source YouTube)
Waking up in the morning would be so much better if I had one of these next to my bed. This would also be so helpful if the power went out.