A charcoal cooler is a storage chamber that uses evaporative cooling to keep food fresh without electricity. It's made of an open frame with charcoal-filled sides that are kept moist. * How it works Warm, dry air passes through the moist charcoal The charcoal draws energy from its surroundings Water evaporates into the air, cooling it * Where it's used They can be used to store fruits, vegetables, and dairy milk * How to build one Charcoal coolers can be built from locally available materials Yo

41 reactions | Magnetic Semiconductor Phone Cooler ✨ mini-sized, ultra-light, super portable, and doesn’t take up space. ✨comes with a magnetic plate — just stick it on your phone case, and it’ll stay firmly attached ✨ semiconductor cooling + turbo fan dual cooling technology ✨Designed for low noise, and the RGB lighting | Ninjaz | Facebook