http://practicalaction.org/page/12
Zeer pot refrigeration (design) See also: Zeer pot refrigerator (basic topic article) Figure 1: Conceptual Flow of Energy and Water in Zeer Refrigerator The following shelf-life comparison has been adapted from a case study performed by the Practical Action Organization and can be directly accessed here. The impact of the pot-in-pot refrigerator is immediately realized as the shelf life for most produce is extended by 5 to 10 times.
Growing Amaranth and Quinoa Recipes There are so many similarities between quinoa (keen' wah) and amaranth that it seems appropriate to describe them together. Quinoa, however, is a cool weather crop and amaranth is a warm weather one. Quinoa and amaranth are two very old, high-protein plants that hail from South America. They were held sacred in ancient Inca and Aztec cultures. Misconceptions Spinning the Moon Bad Astronomy: The Moon only shows one face to us because it is not rotating. Better astronomy: The Moon only shows one face because it is rotating, once every time it revolves around the Earth. Best astronomy: The Moon does not appear to rotate in the reference frame where the Earth-Moon line is fixed in direction, but it does rotate as seen by an outside observer.
Ground Beetles Reduce Weeds Ground beetles could play an important role in ensuring future food security by munching on weed seeds that would otherwise grow to compete with food crops. Researchers have found that ground beetles play a role in weed control in farmland soils. Using data from 257 conventionally managed fields throughout the UK, researchers determined the effect of ground beetles in the soils of sugar beet, maize and spring and winter oilseed rape fields. Seed predation by naturally occurring beetles in farmland does have a beneficial effect, reducing weed numbers in fields and potentially improving agricultural productivity. Evaporative Cooling (original) Much of the post-harvest loss of fruits and vegetables in developing countries is due to the lack of proper storage facilities. While refrigerated cool stores are the best method of preserving fruits and vegetables they are expensive to buy and run. Consequently, in developing countries there is an interest in simple low-cost alternatives, many of which depend on evaporative cooling which is simple and does not require any external power supply.
New York 1. 'New Amsterdam' as it looked in 1664 Click to enlarge. Source: "The American Heritage History of the Thirteen Colonies", 1967 pp 130-31 Picture Source: Valentine's History of New York, pp 367 Fears, Rules, Words, Questions « Teaching Science A quick lesson description here; I’ve been far too focused on political stuff recently. I thought I’d blogged this before, but apparently not. (And while I’m reviewing – 120 posts. Yeah, really.) Anyway. It’s the time of year, after summative exams for our KS3 classes, that we teach Reproduction to year 7.
Scientific and technical books of yesteryear The Sciencemadness library currently holds 50316 pages of reading and reference material in 106 volumes. Shorter articles from the old Sciencemadness library remain available. Thanks go to BromicAcid for providing hosting for these old books during our time of lean bandwidth. Thanks also go to S.C. Wack for providing many of the books found here. Most of these books are provided as PDF with JBIG2 compression. New York State Historical Literature Collection The Cornell University Library New York State Historical Literature is a collection of selected monographs, pamphlets and other materials with expired copyrights chosen from from the Cornell Library's extensive collection of New York State Literature. These were materials that were brittle and decaying and in need of rescue. These materials were digitally scanned and facsimile editions on acid free paper were created. For more information, please visit the About page.
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