Mildly interesting
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How to Make a Compass
- Place a 90 cm stick on the ground and put a small rock where the tip of the shadow falls.
- Wait ten to fifteen minutes and place a second rock at the point where the tip of the shadow has also moved.
- Draw a line between the two points. This is an east-west line.
- Place the tip of your left foot on the first rock and the tip of your right foot on the second rock; now you will be facing north.
š§Anywhere on Earth, the first shadow mark is west, and the second is east.
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South Korean professor Cho Jae-Weon has developed a groundbreaking toilet that transforms human waste into energy and rewards users with digital currency.
Each person's daily 500g of feces is converted into 50 liters of methane gas, producing 0.5 kWh of energy. Users of this innovative toilet earn gool, a digital currency aptly named "shit coin."