There are approximately 840 million people worldwide who do not have access to electricity.

Desalination is the answer to long-term water security, but it's also expensive and energy-intensive. Scientists are developing options.

A simple cooling system driven by the capture of passive solar energy could provide low-cost food refrigeration and living space cooling.

Although the supply of lithium around the world is plentiful, getting access to it and extracting it remains challenging and inefficient.

Replacing salt with a low-sodium alternative lowers the risk of stroke in people with high blood pressure or prior stroke.