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62World Population: How Did It Get So Big?
by riversedge
The world could have fed no more than half of today's population had it not been for two technological innovations: the Haber-Bosch process, invented in 1909, and high-yield varieties of corn, wheat and rice, developed in the 1930s, '40s and '50s. published 4 months ago
63Natural and Synthetic Fertilizer
by len7288
a. Natural Fertilizers. The natural fertilizers are materials derived from plants and animals. It is divided into two major groups; organic fertilizers and organic manures. Organic Fertilizers. All the... published 3 months ago
64Uses of Cryogenics And Methods Used To Produce An Ultracold Temperature
by len7288
Cryogenics is the production of very low temperatures and the study of phenomena at those temperatures. The range of temperatures with which cryogenics is concerned is not precisely defined, but it... published 11 months ago
52Characters of Good Water
by trefoil
A good criterion of the purity of water fit for domestic purposes, is its softness. This quality is at once obvious by the touch, if we only wash our hands in it with soap. Good water should be... published 6 days ago
54Nitrogen in Your Tires - Is It All a Lot of Hot Air?
by jamesburchill
Actually... no. But it will require a little explanation and some basic chemistry discussion so here goes - The earths atmosphere is composed primarily of Nitrogen (78%), the remaining balance is a mixture of... published 5 months ago
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