Consumer & Gadgets

How do ionic hair dryers work? Can they do what they promise?

If you've been in the market for a new hair dryer, you've likely seen advertising for ionic ones. Some claim to produce negative ions in the millions—with or without the help of added minerals like tourmaline.

Engineering

Depleted oil fields offer hydrogen storage sites

Hydrogen is a clean-burning gas that could help to tackle climate change by reducing our dependence on fossil fuels. But storing and transporting hydrogen is expensive and technically challenging, typically requiring high-pressure ...

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