Showing 31 posts tagged africa
This unusual underwater journey in South Africa involves kayaking legend, French expat, and mad inventor Olivier Feuillette, and a modified kayak. With a waterproof top, a ballast (so that it will sink), scuba tanks for oxygen, a CO2 filter, an oscillating fishtail, and pedals, Feuillette’s SUBO becomes a one-person submarine that’s ready to go where no kayak has gone before.
Israel Dejene, founder of Ethio Skate, narrates this film by Aaron Hutchinson and Across the Pond. Dejene describes his passion for skateboarding and how he is using the sport to engage, inspire, and empower kids — boys and girls between the ages of 6 and 19 — in his neighborhood of Addis Ababa, Ethiopia. As a part of the project, he built the first-ever skate ramp in Ethiopia, and hopes to build skate parks across the country.
Madagascar is the fourth largest island in the world and is home to over 5% of the total species found on Earth.
From a yard in Kampala, Uganda, Moses explains how to build a solar oven using a tire, some glass, newspaper, silver foil, tape, a black pot, and a few hours.
If you’re cooking outside or don’t have an oven, solar ovens are a great alternative for making a hot meal. Building materials are generally inexpensive and easy to find, and rather than requiring fuel or firewood, solar ovens take advantage of a sustainable resource: the sun. How does it work?
- Concentrating sunlight: A reflective mirror of polished glass, metal or metallised film concentrates light and heat from the sun on a small cooking area, making the energy more concentrated and increasing its heating power.
- Converting light to heat: A black or low reflectivity surface on a food container or the inside of a solar cooker improves the effectiveness of turning light into heat. Light absorption converts the sun’s visible light into heat, substantially improving the effectiveness of the cooker.
- Trapping heat: It is important to reduce convection by isolating the air inside the cooker from the air outside the cooker. A plastic bag or tightly sealed glass cover traps the hot air inside. This makes it possible to reach temperatures on cold and windy days similar to those possible on hot days.
- Greenhouse effect: Glass transmits visible light but blocks infrared thermal radiation from escaping. This amplifies the heat trapping effect.
There are more inventions and sustainable ideas in the archives, including Spain’s first 24/7 Concentrated Solar Thermal Power plant.