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$2 Do-It-Yourself Solar Lamp Brings Better Light To Poor

by Michael Keller

When the sun goes down on almost 1.3 billion people around the world, the only respite from the darkness is fire. These are the people who have no access to electricity. If children want to study, or adults want to remain productive, or families want to sit and talk, most must do it by light of a flame.

But light sources like wood, candles, or hydrocarbons like kerosene oil, which was burnt at the rate of 38.7 million gallons a day in 2010, are far from the best solution. Combustion is dirty, releases toxic chemicals and can be expensive.

“A fifth of the world’s population earns on the order of $1 per day and lacks access to grid electricity,” wrote Evan Mills, a Lawrence Berkeley National Lab staff scientist, in the 2012 technical report Health Impacts of Fuel-Based Lighting. “They pay a far higher proportion of their income for illumination than those in wealthy countries, obtaining light with fuel-based sources, primarily kerosene lanterns. The same population experiences adverse health and safety risks from these same lighting fuels.”

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Fiber-Optic Solar Toilet Turns Sewage To Plant Friend

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by Michael Keller

World Water Day is coming up this Saturday. One of the event’s goals is to bring attention to the billion people who live without access to safe drinking water.

A major obstacle standing before that objective is a lack of the sanitation that would prevent human waste from polluting water supplies. One innovation, a solar-powered, fiber-optic-equipped toilet that requires no water and sanitizes sewage with high heat, is among several that are trying to fix the problem and improve public health.

Developed by engineers at University of Colorado Boulder, the system uses eight parabolic mirrors that focus sunlight onto an area the size of a postage stamp. This energy is then piped through fiber-optic cables to a reaction chamber that heats waste to 600 degrees Fahrenheit. 

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Robots Test Tools For Myanmar’s Farmers

Proximity Designs is a Myanmar-based social enterprise that designs products to improve poor people’s lives. Some of the affordable creations they’ve made include foot-powered water pumps, drip irrigation systems, solar lanterns and even infrastructure projects like bridges.

An integral part of their design and manufacturing process involves putting prototypes through trials with robots that use them until they break. The group says their line of farming aids all get pushed to failure by their lab’s robot farmers, which helps improve how they’re made.

Building a reliable product is important if it is to be used under the strain of daily life in rural Myanmar. A product like a manual water pump relieves farmers of the backbreaking work of carrying up to 10 tons of water a day on their backs from distant wells.

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Origami Makes 50-Cent Paper Microscope That Magnifies 2,000 Times

Stanford University bioengineer Manu Prakash has developed a microscope made of paper that costs 50 cents to make. Using the magic of origami, the Foldscope device can focus through a sample mounted on a standard slide in micron-length steps. It can magnify objects 2,000 times with sub-micron resolution without needing any external power.

The instrument is part of Frugal Science for Public Health, an effort by Prakash’s team to democratize science. Healthcare workers can use it to diagnose infectious diseases like malaria and those caused by pathogenic bacteria, and it can also be used as a teaching aid.

See the ted talk below from which these gifs are made.

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