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Sharing knowledge to build rich, sustainable lives.

Appropedia is for collaborative solutions
in sustainability, appropriate technology, poverty reduction, and permaculture.

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your site to find, co-create and improve the solutions we need. Our vision and mission.

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Browse our categories or all 7,315 articles.

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Aprologo-old.png As we approach our ten-year anniversary, we are looking at how best to support Appropedia in the next ten years. Please share your thoughts with us on the idea of appointing an Executive Director.

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Yeast Cakes from Hops
Yeasts for Baking. Generally when one mentions yeast, aromatic loaves of fresh homemade light bread come to mind. And so they should. Aside from acting as a leavening agent in bakery products, yeast is also the ingredient responsible for the tantalizing aroma that arises during baking.

Though probably today the most commonly known and used are store-bought packages of dried yeast, there are several other different kinds. The recipes that follow show two examples of different ways to make yeast--dry yeast cakes made from hops and an everlasting yeast "starter"--and also how the yeasts are used in making bread.

The dry yeast cakes are made in part by boiling the blossoms of the hop vine. These flowers contain a fragrant yellowish oil called lupulin. The use of this oil as a preservative in beer and as a narcotic drug originated in Germany before Charlemagne. Since then its use has become widespread and the vine cultivated in other nations, including America.

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Aleiha's parabolic solar cooker

A very hot (400 °F) parabolic solar cooker. Made from an reclaimed satellite dish using bicycle powered tools.

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Marble bust of Aristotle.
Educating the mind without educating the heart is no education at all.

The Sun photographed by the Atmospheric Imaging Assembly (AIA 304) of NASA's Solar Dynamics Observatory (SDO).
Solar energy, radiant light and heat from the sun, has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar radiation, along with secondary solar-powered resources such as wind and wave power, hydroelectricity and biomass, account for most of the available renewable energy on earth. Only a minuscule fraction of the available solar energy is used.

Solar powered electrical generation relies on heat engines and photovoltaics. Solar energy's uses are limited only by human ingenuity. A partial list of solar applications includes space heating and cooling through solar architecture, potable water via distillation and disinfection, daylighting, solar hot water, solar cooking, and high temperature process heat for industrial purposes.To harvest the solar energy, the most common way is to use solar panels.

Solar technologies are broadly characterized as either passive solar or active solar depending on the way they capture, convert and distribute solar energy. Active solar techniques include the use of photovoltaic panels and solar thermal collectors to harness the energy. Passive solar techniques include orienting a building to the Sun, selecting materials with favorable thermal mass or light dispersing properties, and designing spaces that naturally circulate air.

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ENGR 215 Introduction to Design projects – Spring 2009: WaterPod: The Spring 2009 semester of ENGR215 Introduction to Design worked with the WaterPod to research, design, and build systems that foster the artists living sustainably onboard a barge in the waterways of New York City.

Spring 2009 ENGR 215 Intro to Design Projects - WaterPod
Bicycle Energy Generator
An alternative way to convert kinetic energy to AC power by means of a bicycle energy generator  
Soil-less Growing System
A system that would grow food for the occupants of the barge without the presence of soil  
Filter Commander 9000
A water filtration system to make drinkable water from rainwater catchment  
Tour de Volts
A bicycle as a power source to provide a bit of extra energy to the WaterPod  
WaterPod Hang Thyme
A hydroponic green wall that is used to grow herbs in minimal amounts of space  
FBD Rainwater Purification
Exists to provide clean drinking water for the WaterPod Project  
Coopatron 5000
A chicken coop designed to supplement the dietary needs of the inhabitants of the WaterPod  
Rocket Stove
To provide a reliable and sustainable means of cooking by minimizing fuel use and optimizing efficiency  
Pico in a Bucket
To harness the kinetic energy of the falling water from the overflow of the WaterPod's water tower  
WindPod Turbine
A vertical access wind turbine that uses the power of the wind coming from any direction to create energy  
Composting Toilet
Duchamp de Loo, is a composting toilet system that can be used and can educate people about environmental ways to get rid of human waste  
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