There are telltale signs that your car's lead acid battery might need water replenishment. Maintenance-free or valve-regulated lead-acid batteries (VRLA) are the types that don't need watering, hence ...
11don MSN
Turning mine waste into clean water: Research shows promise for acid mine drainage recycling
Scientists from Heriot-Watt and the University of South Africa have developed a method to convert hazardous acid mine ...
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